A low-cost, fully electric, fully self-driving RV the size of a shipping container

1. The premise

A standard ISO container is a brutal design brief: about 2.4 m wide, roughly 2.9 m high externally for a high-cube, and either 6 m (20′) or 12 m (40′) long. As a living volume that is still modest; as a road vehicle envelope it is already wider and taller than many passenger cars, and a full 40′ box is truck territory.

“Fully electric” means no diesel generator as a crutch for range. “Fully self-driving” means the hard version of autonomy — not adaptive cruise on a good day, but the expectation that the vehicle can move people and their stuff without a licensed pilot in the loop for ordinary trips. “Low cost” is the third constraint that makes the first two interesting: if the only way to close the triangle is a six-figure battery and a robotaxi-grade sensor suite, you have a lab demo, not a recreational product.

The rest of this page narrows the mission so the triangle can close. Assume the vehicle drives only short distances, spends most of its time parked, and is software-limited to about 80 km/h. Range is not a hero feature. Neither is cargo capacity. The product is closer to a mobile tiny home on a multi-axle skateboard than to a Class A coach that pretends it is a highway car.

2. Form factor: container as constraint

Road rules, not container standards, decide what you can actually drive. In much of North America, legal width without special permits is about 2.6 m (8′6″); a container’s ~2.44 m exterior width fits, but once you add mirrors, fenders, insulation, and structure, the “shipping box on wheels” fantasy meets chassis and body engineering immediately.

Height is similar: high-cube exterior height is already near the comfort zone for bridges and parking structures. Length is a spectrum: a 20′ class living module is more “tiny home on a purpose-built EV skateboard”; a 40′ class vehicle is closer to a Class A coach or box truck in mass, tire count, and licensing — but under a short-range, mostly parked duty cycle, that length buys living volume without forcing a Semi-sized battery.

Mass is the quiet killer. Steel containers are heavy before you add battery, motors, suspension, furniture, water, and people. A low-cost design almost certainly does not reuse a steel intermodal box as the primary structure; it uses the dimensions as a size target while building a lighter monocoque or spaceframe body meant for the road. ISO corner-casting strength is for stacking freight on ships — not a requirement for a road camper that never sees a crane.

• Envelope: 40′ high-cube exterior dimensions as the living target; structure is purpose-built, not a scrap container.
• Body: composite or aluminum skin over a multi-axle EV skateboard — no steel ISO box mass tax.
• Interior: fixed wet cell + transformable living space; volume is the scarce resource.
• Curb mass ballpark: roughly 4.5–7.5 t empty of fluids; loaded maybe 6–9 t — far below a freight Semi GCW.

One credible road form factor is the cabless hauler pattern: a low electric skateboard with multi-axle e-drive, corner sensor pods, and a lock interface for a 40′ box — the same family of idea as commercial autonomous container haulers, but with the box fitted as a living module (windows, door, solar, wet cell) rather than sealed freight. Explore a rough interactive sketch below.

3. Energy: batteries vs a rolling house

A boxy RV is aerodynamically rude. At true highway speed, drag dominates. Ballpark consumption for a large, tall electric vehicle is often quoted in the 300–600 Wh/km range depending on speed, mass, and weather — several times a compact car. Cap the vehicle at 80 km/h and the worst of the aero tax eases; 350–550 Wh/km is a fair planning band for a tall ~7 t brick on short hops. That is still expensive energy if you insist on 500 km of range — but we do not.

Order-of-magnitude pack math (pack-level, not cell fantasy): roughly 150–180 Wh/kg usable pack energy density and on the order of $80–120 / kWh pack cost at volume in the mid-2020s, trending down but not free. A 100 kWh pack is then hundreds of kilograms and low-to-mid five figures of cost before integration, thermal management, and structure.

Under a mostly parked duty cycle the traction pack is also the house battery. You do not need a Semi pack. You need enough energy for a few days of living plus one reposition:

• 60 kWh → ~130 km at 450 Wh/km — local only, tight.
• 80–100 kWh → ~180–220 km — the sweet spot for short moves.
• 120 kWh → ~270 km — optional “weekend hop” buffer.

A 30 km site-to-site hop is only ~10–15 kWh. The hard problem is not driving; it is parked loads — fridge, lights, pumps, and especially HVAC. That is where the roof solar (next section) earns its keep.

Use the estimator below (implemented in Rust WASM) to feel the trade: larger packs buy range and cost mass and money; they do not fix the aero tax of a house-shaped vehicle. The default ~90 kWh is the short-range product case, not a coast-to-coast fantasy.

4. Solar: the roof is the point

A 40′ high-cube roof is one of the few places where the container envelope is an advantage over a passenger EV. Exterior plan area is about 12.2 × 2.44 m ≈ 30 m². After rails, vents, edge setback, and imperfect flat-roof tilt, usable PV area is roughly 20–24 m².

Modern modules around 22% efficiency deliver on the order of 220 W/m² under standard test conditions. That is a ~4.5–5.3 kW peak array on this roof — not a decorative strip.

Real daily yield needs a system derate (heat, dirt, wiring, non-ideal tilt). Using ~0.75 and a ~4.8 kW nameplate:

What does a parked house actually burn?

• Fridge + electronics + lights + pumps: roughly 2–5 kWh/day.
• Heat-pump HVAC in mild weather: add ~5–12 kWh/day.
• Hard AC or hard heating: add ~15–35 kWh/day — solar alone will not always cover it.
• Sparse induction cooking and water heat: a few kWh more on active days.

In mild climates with an efficient shell, roof solar can cover most or all parked energy for much of the year. In hot desert summers or northern winters it is a buffer, not full independence — shore power, destination charging, or an occasional drive-to-charge still matter. Either way, for a vehicle that mostly sits, solar changes the pack story: you size the battery for a few days of house + one move, not for weeks of generator-free highway touring.

Energy story in one line: drive 30 km (~15 kWh), stay a week, take ~100 kWh from the sun in a decent climate, leave without ever needing a 500 kWh Semi pack.

5. Autonomy: the expensive last 1%

Highway lane-keeping and adaptive cruise are commodity-ish. Full self-driving in the sense of unsupervised operation on public roads — weather, construction, pedestrians, parking lots, dirt access roads to campsites — is still the frontier where companies burn billions.

Sensor suites (cameras, radar, optional lidar), compute, mapping, validation, and liability dominate cost long after the motors are chosen. For an RV, low-speed yard maneuvering and remote tele-assist might be more valuable than unsupervised city driving, and far cheaper to make honest. Regulatory regimes also differ by jurisdiction; a product that is legal to sell as “fully self-driving” in one market may be “driver assist only” in another.

If the builder is Tesla-scale, camera + onboard computer hardware is already amortized across Model Y volume — the bill of materials is cheap (order of $1–2k for the hardware stack). The remaining cliffs are validation, liability, and selling unsupervised operation with sleeping occupants — none of which disappear because the body is a container envelope.

• Cheap-ish: ADAS for fatigue reduction, parking assist, and low-speed repositioning.
• Hard: unsupervised door-to-door trips with sleeping occupants.
• Hardware is not the bottleneck; honesty about the product label is.

6. Cost estimate: Tesla-scale, short-range mission

Ignore the open-source framing for a moment and ask a different question: what would this cost if a company that already builds high-volume EVs and multi-axle electric trucks built it? Use the best-selling Tesla car as the cost DNA, and the Tesla Semi as the truck architecture benchmark — then delete most of the Semi because range, cargo, and speed are not the mission.

Benchmarks

The Semi exists to pull 82,000 lb combination weight for hundreds of miles. This RV does not. Continuous road load at 80 km/h for a tall ~7–8 t vehicle is on the order of 40–80 kW on the flat; 150–250 kW peak covers hills and launch. That is one strong passenger-EV motor class — not three heavy-truck motors at 800 kW. Pack target: ~90 kWh (about one Model Y Long Range class pack), not 500–800 kWh.

Unit cost stack (volume production)

Assumptions: Tesla-like vertical integration and cell pricing (~$90/kWh internal pack planning band), interior that is minimal rather than yacht-grade, and volume on the order of 10k+ units/year for the base case. Pilot volumes are materially more expensive per unit.

Sticker price

Gross margin, R&D amortization, and overhead often put volume EV stickers roughly in a 1.4–1.8× band over manufacturing cost (order-of-magnitude, not a finance model). That maps to:

Anchors: a Model Y is ~$40–50k; a Tesla Semi is ~$260–300k; mid Class C and premium camper vans often land ~$200–260k+; Class A coaches frequently $250–500k+. The interesting claim is not “cheaper than a Model Y” — body and wet cell make that unrealistic — but undercutting traditional Class A money while beating Semi money, by deleting cargo GCW, most of the pack, and most of the motors.

Recommended product sketch

Where cost still bites even for Tesla: multi-axle motorhome certification; RV interior labor; low volume in early years; and liability for unsupervised driving with sleeping occupants. Battery and motors are no longer the cliffs once the mission is honest.

7. Housing comparison: price per square metre, rents, and leases

A container-scale RV is not only a vehicle; for someone who mostly parks it, it competes with housing. The fair yardsticks are purchase price per unit of living area, monthly rent for comparable space, and — if Tesla builds and finances it — a monthly lease payment in the same language as passenger-car leases.

Living area of the box

A 40′ high-cube envelope is about 12.2 × 2.44 m outside (~30 m² footprint). Interior floor of a true ISO box is about 28 m² (~300 ft²); after insulation, structure, and a wet cell, usable living floor is more like 22–26 m² (~240–280 ft²) — studio territory, not a suburban house. The comparison below uses ~25 m² (~270 ft²) as a mid usable figure and $140,000 as the base Tesla-scale MSRP from §6.

U.S. house prices (mid-2026 ballpark)

National medians move month to month, but order of magnitude for recent U.S. sales and listings:

• Median home sale price on the order of $400k (Census/FRED and major listing indexes cluster near that band in 2025–2026).
• National median listing price per square foot around ~$220–230 / ft² (~$2,400–2,500 / m²) in mid-2026 — roughly half the per-area purchase price of this RV.
• Hot coastal markets are another world: large California and Seattle-class metros often trade around $500–650+ / ft² (~$5,400–7,000 / m²). On pure dollars per living square metre, a $140k mobile studio can undercut those markets while still looking expensive versus Midwest or Southern single-family stock.

Read that carefully. Against a national median house, the RV is expensive housing per square metre — you are paying for motors, battery, chassis, and a factory interior in a tiny footprint. Against expensive coastal purchase prices, it is in the same band or cheaper per living area, and you still have to park somewhere (land, pad, or lot fee is extra). The product thesis is not “cheaper than every American house”; it is “a relocatable studio whose all-in sticker is a fraction of a median mortgage principal, with a car built in.”

U.S. apartment rents

Recent national rental snapshots (50 largest metros / national asking medians, early–mid 2026):

• Overall median asking rent in large metros around $1,650–1,750 / month.
• Studios roughly $1,350–1,450; 1-bedrooms ~$1,500–1,600; 2-bedrooms ~$1,700–1,850 (varies by index and month).
• National average apartment size often cited near ~700–900+ ft² depending on the dataset — larger than this RV’s usable floor, so rent per square foot for small units is usually higher than for big ones.
• Ballpark rent intensity: about $2.0–2.5 / ft² / month annually averaged (~$22–27 / m² / month), with studios and coastal markets higher.

If you priced the RV’s ~270 ft² of living space at a modest $2.50 / ft² / month apartment-equivalent rent, you get about $675 / month for the space alone — before parking, utilities, or the fact that the unit can move. A large-metro studio asking rent (~$1,400) buys more square metres in many buildings, but not wheels, solar, or the ability to leave.

Tesla-style lease: what monthly payment is plausible?

Tesla publishes lease offers for its cars (see Tesla’s model comparison / current offers pages — terms change often). As of mid-2026, promotional U.S. Model Y leases were in the ballpark of:

Those figures are not a promise for an RV product; they are a calibration for how Tesla prices monthly access to a ~$40–60k asset. A crude scale from Model Y RWD (~$42k all-in starting price, ~$459/mo advertised) is about 1.1% of MSRP per month on the sticker payment, or closer to ~$570–600 / month effective if you amortize due-at-signing over 36 months. Residual value, mileage caps, money factor, and credit tiers all move the real number.

Apply the same order of magnitude to a $140k RV:

• Sticker-style payment: 1.1% × $140k ≈ $1,540 / month advertised, before taxes.
• With proportional due-at-signing (~10% of MSRP, as on many Model Y promos): roughly $14k down + ~$1,500–1,600 / month, or an effective ~$1,900–2,000 / month if you roll DAS into the 36-month cost.
• Residual-driven range: if depreciation and finance charges behave more like a specialized vehicle (weaker residual than a Model Y), payments could land $1,700–2,200 / month. A strong residual program (fleet buyback, high expected demand) could hold closer to $1,400–1,600.

Planning band for a Tesla-style 36-month lease on the $140k base RV: about $1,500–2,000 per month all-in effective, or roughly one large-metro 1-bedroom rent that also includes your transport — or a bit more than a studio if residuals are weak.

Whether that is a good deal depends on use. If the RV replaces both a car payment (~$450–700 for a leased Model Y) and rent (~$1,500–1,700), a ~$1,600–1,900 combined lease can look rational — especially with solar covering much of the parked energy bill. If it is a third vehicle plus a weekend toy on top of a full apartment, it is just an expensive hobby. Zoning, insurance, and where you may legally live in a vehicle will matter more than the payment math.

One more honesty check: auto leases assume high residual values and tight mileage. A mostly parked house-on-wheels may help residuals (low odometer) or hurt them (oddball segment, interior wear, regulatory uncertainty). The $1,500–2,000 band is a bridge from Tesla’s published car leases, not a term sheet.

8. Open questions and a FOSS angle

The cost model above assumes a closed, high-volume OEM. Fossall’s interest is different: which pieces of the same idea can still be open even if the vehicle is not a git repo?

• Software — energy management UIs, trip planners tuned for RV duty cycles, open diagnostics, non-cloud lock-in for vehicle telemetry the owner actually owns.
• Design — published dimensions, mass budgets, solar and pack assumptions, and interior modules others can fork (the way open hardware frames spread in other domains).
• Not magically open — cell factories, full autonomy stacks trained on proprietary fleets, and type approval. Fossall’s bet is not that the whole vehicle is a git repo; it is that the closed middle of mobility should shrink.

A shipping-container-sized electric, self-driving RV that is cheap is probably impossible if you demand all three adjectives at once in their strongest form — unlimited range, unsupervised door-to-door autonomy, and Model Y pricing. Narrow the mission to short moves, mostly parked, 80 km/h, honest solar, ~90 kWh and a Tesla-scale builder could plausibly land near $130–170k purchase or roughly $1,500–2,000 / month leased. That is not free. It is in the same conversation as premium vans, mid Class A coaches, and — for some people — replacing a car lease plus a studio rent with one payment.