What size cargo trailer camper should I build?
The single most common question we get is what size cargo trailer to build for a camper conversion. It is also the most expensive question to get wrong. Buy too small and you will outgrow it in a season. Buy too big and you may discover your vehicle cannot tow it loaded, your driveway cannot store it, and half the campsites you want cannot fit it.
This guide walks through the decision the way we would make it ourselves: tow vehicle first, then sleeping capacity, then standing height, then budget. By the end you will know exactly which size fits your build.
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What sizes do cargo trailer campers come in?
Most conversions are built on one of five common footprints. Here is how they compare at a glance.
5x8 (40 sq. ft.)
Empty weight: roughly 900 to 1,200 lbs
Sleeps: 1 to 2
Best for: solo travelers, weekenders, small tow vehicles
See our 5x8 build guide and 5x8 inspiration builds
6x10 and 6x12 (60 to 72 sq. ft.)
Empty weight: roughly 1,300 to 1,800 lbs
Sleeps: 2
Best for: couples, the best all-around balance of space and towability
See our 6x12 build guide and 6x12 inspiration builds
7x12 and 7x14 (84 to 98 sq. ft.)
Empty weight: roughly 2,000 to 2,600 lbs (usually tandem axle)
Sleeps: 2 to 4
Best for: couples who want a fixed bed plus a dinette, families of three
See our 7x14 build guide and this standout 7x12 conversion
7x16 (112 sq. ft.)
Empty weight: roughly 2,400 to 3,000 lbs
Sleeps: 2 to 4
Best for: full-time couples, builds with a real bathroom
8x16 and larger (128+ sq. ft.)
Empty weight: roughly 2,900 lbs and up
Sleeps: 4+
Best for: families, full-timers, toy haulers with a garage area
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What size cargo trailer camper should I build?
What size cargo trailer can my vehicle tow?
Your tow vehicle makes this decision before you do. The number that matters is your vehicle's tow rating minus the finished weight of the trailer, and finished is the key word. A typical conversion adds 700 to 1,500 lbs of insulation, framing, cabinetry, water and gear on top of the empty trailer weight. Then keep a safety margin. We recommend staying under 80 percent of your rated capacity.
Small SUVs and crossovers (1,500 to 3,500 lb rating)
A 5x8 is your ceiling, and a light one at that. Build with weight discipline.
V6 SUVs and midsize trucks (5,000 to 7,000 lb rating)
A 6x12 or 7x14 fits comfortably. The Scandinavian 7x14 build in our 7 smart conversions roundup finished at 2,920 lbs and tows behind a Toyota Tacoma V6.
Full-size trucks (9,000+ lb rating)
Any size on this list, including 8x16 and up.
Two tools make this real instead of theoretical. A portable trailer tongue scale tells you your actual tongue weight, which should sit between 10 and 15 percent of total trailer weight. For trailers 6x12 and up, an Andersen weight distribution hitch keeps the rig level and stable at highway speed.
How many people need to sleep in it?
Solo: a 5x8 works if you run a crosswise bed or convertible setup. Our solo traveler's guide covers the layouts that make 40 sq. ft. livable, and a 6 inch memory foam mattress keeps the bed height low enough to preserve headroom.
Couples: 6x12 is the minimum we recommend for two people traveling more than a few weekends a year. At 7x14 you gain the option of a permanent bed plus a seating area, so you stop rebuilding your bed every morning. A RecPro dinette booth and bed set converts one footprint into both.
Families: 7x16 or 8x16. A Disc-O-Bed bunk system sleeps kids without permanent framing, which keeps the floor plan flexible for the day you stop hauling children and start hauling bikes.
Can you stand up in a cargo trailer camper?
Interior height is the spec buyers forget until it is too late. Standard cargo trailers run about 6 feet inside, and you will lose 2 to 4 inches to floor and ceiling insulation. If anyone in your party is close to 6 feet tall, order the extra height option (usually 6'6" or 7 feet) when you buy the trailer. It typically costs a few hundred dollars new and cannot be added later.
Height also determines ventilation placement. Whatever size you choose, plan for a roof vent fan from day one. The Maxxair Maxxfan Deluxe is the one we recommend across every trailer size, and our roof vent fan guide compares the alternatives.
How does trailer size change your power system?
Size determines how much power you need and how much roof you have for solar.
5x8 and 6x12 builds
Skip the wiring project. An all-in-one power station covers lights, fans, a 12v fridge and device charging. The EcoFlow RIVER 3 Plus handles weekend trips in a 5x8, and the EcoFlow DELTA 3 Classic (1024Wh) is the right starting point for a 6x12.
7x14 and larger builds
Bigger builds run bigger loads and have the roof space to feed them. Either step up to the EcoFlow DELTA 3 Max (2048Wh) or build a component system from Renogy: a 320W solar panel 2-pack on the roof, a Rover MPPT charge controller, a 12V 300Ah lithium battery and a pure sine wave inverter. A 7x14 roof fits two 320W panels with room for the vent fan; a 5x8 roof does not.
We compare both approaches in depth in our guide to choosing your cargo trailer's power system.
How much does each size cost to convert?
The trailer is the smaller half of the budget. Plan for the build to cost as much as the trailer, and often more.
5x8: $2,500 to $4,500 for the trailer new, total builds commonly land between $5,000 and $10,000
6x12: $4,000 to $6,500 for the trailer new, total builds commonly land between $8,000 and $15,000
7x14 and 7x16: $6,000 to $9,500 for the trailer new, total builds commonly land between $12,000 and $25,000
8x16 and up: $8,000 to $12,000+ for the trailer new, total builds commonly run $18,000 to $30,000+
These ranges reflect DIY labor. If you would rather hire the work out, our guide to cargo trailer camper builders and what they cost covers professional pricing, and our vetted builder directory is the short list we trust.
Which size should you actually buy?
After featuring dozens of builds, our recommendation is consistent: buy the 6x12 unless you have a specific reason not to. It sleeps two comfortably, tows behind a V6, fits in a normal driveway, stays welcome at nearly every campsite, and leaves enough budget for the insulation, power, and ventilation that make a conversion actually livable.
Go smaller only if your tow vehicle forces the issue. Go bigger only if you are traveling with more than two people, need a real bathroom, or plan to live in it full-time. In those cases, the 7x14 is the sweet spot, and the extra-height option is mandatory, so order it with the trailer.
Ready to start planning? Work through our ultimate guide to cargo trailer camper conversions, browse 85+ build ideas, and check our 8 things to know before starting a conversion so your first weekend of ownership goes to building instead of returning parts.
