It's been a while since I posted this question. I've come up with another idea that's probably been around. ? I'm thinking of getting a 5x10 open utility trailer then building modular boxes for a kitchen, bathroom, and sleeping/storage. For 10 feet clear length, maybe a 6 foot sleep/store box, a 30 inch bath/shower box, and an 18 inch kitchen box.
They would each be 5 feet wide and have windows on the sides but the front & rear side would have matching window-door panels that could come out so adjacent modules would seal together with a large pass-thru opening.
The trailer with plates could always be stored outside while unused modules couldbe built low enough to fit in my garage when not in use. The module height minus axle & flatbed would be higher than a full trailer that would normally fit in the garage.
Each module would be self contained for fresh & waste water storage.
Starting with a 2000 pound trailer with an optimistic 1050 pound empty weight, the 3 modules would have to be less than 950 pounds total in useful shape. Then based on needs of the day or weekend, leave a module or 2 or 3 in the garage to gain useful hauling weight.
What do you think?
I just wanted to add that I am not committed to a DIY project, so if you know somebody who sells something similar I'm all ears. I could also change tow vehicles without much of a penalty, but I am thinking that every commitment to one thing is also a barrier to other things (like trying to keep my jeep limits my options, perfect example). I'd really like to have a utility trailer, and a half-toy hauler, and a small camper, and a picnic kitchen, and so on. It's not a thing for the full-time RV life but for the suburbanite it might work out well.