This is my 24’ my barracuda nose comes up to about 1’ away from the tool box. The bunk is a twin with a temperpedic mattress. It is made using etrack and aluminum cargo beams that click into the e track. I have two 6 volt golf cart batteries that run the lighting and my inverter. I can watch tv and usually get 15 channels of over the air tv through an antenna. No plumbing, but I have found a good number of the tracks have shower facilities and they never close the restrooms. You need A/C so you could just get a trailer setup for A/C and a generator for power. You could get a 28’ and and do a king size bunk. Make it lower to ease gettin in. The cargo beams are good for 1200lbs each. So they will last forever and are like $30 each. Just let the car cool before you bring it in. Gets toasty with all that hot car, but nice on those cold nights.