Yep – less storage, although the one i looked at had a couple of cupboards that hooked onto the sides when they were up, and you just unhooked them and placed them in the centre aisle when storing/towing.
Edit: didn't see the process of folding it out, although the folks who owned it reckoned about 5-10 minutes, plus then attaching the awning etc.
Re bike carrying, maybe a two-bike (gutter-style) rack could be attached to the front towing bar triangle? This one had a plastic box attached there (for carrying the gas canister), which I think could be removed (and carry the canister in the toilet area instead)