When I bought my cargo trailer 2 years ago, used but like new, I had no intention of camping in it, it was just to haul my 1800 VTX trike.
Mine is a 6X14 V nose, side RV door and rear ramp door. Now I wish it were 7' wide, but hey, I got a steel of a deal for $1500 from a guy cleaning house for a divorce. (He named the price, not me). No scratches, dings or cracks, looks new outside and inside he put in a garage type tile floor, wall mounted storage system, hooks/bags, roof vent and nice wheels with a single axel.
To my point, I think there are advantages to a cargo trailer to build out instead of the factory toy haulers. You know where everything is, electrical, plumbing, insulation and pick your appliances. Downside is the time, planning, building and sourcing items. You don't need to be a real craftsman to duplicate the factory quality, but it takes some basic skills and time, along with some sweat.
You can buy everything the factories put in these rigs, even the side tent drop out and down bunks and folding couch/bunks.
However, dropping another 8-10 grand on a factory job, puts you on the road on day 1, saves 2+ months of work and it looks like an RV. I'm not putting decals on my trailer.
Just a bit more to say; When I bought houses and rehabbed them, I had an Amish crew working for me. If I needed a nice off road worthy toy hauler, I'd hire a good shade tree welder and build one to much better specs than you can buy from an RV lot. I think you could certainly have one made for half, at least 2/3s of what commercial rigs cost and you'd know every inch of that project. If you have the time.
