OK, I did a minimalist conversion of a 7x12 a few years ago and documented it on here. We eventually bout a toy hauler and sold the conversion, but I missed it. We still have the toy hauler and use it quite a bit for CMA (Christian Motorcyclists Association) events, but sometimes it gets aggravating dragging around a 38' toy hauler. I have decided to start another minimalist build so I can pull it to a weekend when my wife isn't going and I don't feel like taking the big toy hauler. We kept the cots from our first conversion (I really like them instead of building a bed and they are large enough for a fat guy like me) so they will be the basis. I will probably try to find a portable A/C this winter (the kind on wheels) so I won't have to build anything to support a window A/C or cut big vent holes in the cargo trailer. I can vent the portable A/C through the floor like I did on the first one. I originally thought about just an extension cord ran through an RV cable hatch, but have just about decided to go with a 30 amp shore plug wired into a small breaker box with a few 15 amp breakers. I don't think I will do any battery power, since it wouldn't run the A/C anyways. Don't know yet about plumbing. I will probably just go with a Thetford curve porta-potty and some sort of quick water supply for hand-washing, etc. in case I have to park a distance away from the bath house. I am looking for ideas and suggestions, since it is a wide open slate.