I haven't abandoned my Fleetwood stretch, but the one thing it was lacking was a bathroom.
I give you Eagle 5:
I bought it for $150 plus a $150 tow to my house. Needs a 454, which I'm picking up on Sunday.
Everything works - generator, both A/C units, both furnaces, plumbing, etc. And it has a toilet.
I had toyed with the idea of putting my spare LT1 in it but the 454 is such a brute I want to build one.