I found a RT Versatile 190 2002 used. It fits for myself and my small dog. Some state parks have length restrictions. This will fit anywhere I can drive @ 19'. It has 4 seats, the back 2 which I plan to remove to use that area for extra storage as I will be living full-time out/in it.
I'll keep rear bed down full-time. It has on board Onan generator which runs off the gas tank. It depends on how much space you think you'll need. Mostly you'll only be sleeping in it or on rainy days, in it. All my cooking is done outside when ever possible, hence portable grill. I have a sea eagle SE9 that I can use on any water that doesn't allow motors. Deflated, it packs up nice, but need the SE8 as the SE9 is a tad too big for just me. Two people will need to realize they will need to live really close! So have hobbies or things to do away from each other.