Can't speak for yours, but I had an earlier model Yukon Delta 25 and the floor was just 2 layers of 3/4" plywood glued/glassed(?) to the bottom. It wasn't sealed. The boat had been sunk and the floor turned to mush. I ripped it all out and installed 2x4 ribs with the floor on top of them so it had something like a "bilge".
You'll have to find a make & model on the toilet before anyone can give you much help there. There should be a pushbutton somewhere to make it work IF it works.
As to the holding tank, maybe you can take it by a pumpout station, or get creative. I'm told some folks have used a shop vac... but I wouldn't want to be the one to clean it!
Not trying to upset anyone but unless it's in really great shape you'll probably end up spending more on it than it'll ever be worth. However there aren't all that many trailerable houseboats out there, so it may be worth it to you.
Check here for more info:
She's a tired old barge but she's paid for! http://s71.photobucket.com/alb...p;current=ef324993.pbw
06:56:39 PM by