[PizzaChop]

Thanks all. I have no interest in keeping or refurnishing this bathroom sink and tub.

I can understand your reluctance to refinish/refurbish 38 year old ABS vanity and tub, but I've found from a carpentry perspective that the curved walls can be challenging to build around (not that I haven't done so) and nothing fits as well as the original fixtures. You might regret that decision later.

Can anyone show me pics of how to put the trailor up on 6x6 lumber? Where the supports should be located etc...

Simply back the trailer up onto 6 x 6 lumber (using ramps). Once elevated, I would lower stabilizing jacks to support the unit throughout and keep it stationary (free from movement).

Im a good arc welder and feel confident in repairing or replacing any structual steel issues.

That will come in handy, but try to avoid the temptation to add weight to the frame when strengthening, as anything aft of the axles can lead to future "sag" issues.

My other question is how to get the flooring out from underneather the channel that sits flat around the edge of the floor. Should I cut the bottom of the wall off a few inches?

The floor is easiest removed by cutting in sections and cutting through hold down bolts attached to frame cross members and floor channel. You must remove (do not cut) the lower section of the interior skin to reveal the floor channel and location of hold down bolts. (This can be done with a reciprocating saw but care must be exercised to avoid piercing the exterior skin.)

Perhaps replace the walls with stainless or aluminum? My intent is to customize this unit even if it takes me years...(retirement home?)

If money is really no object, by all means use polished stainless steel!

I really dont want to have to lift the entire shell off of it just to replace sections of the flooring, like the entire back bathroom.

The entire rear floor section can be removed and replaced without lifting the shell. I've done it twice on two different layouts and while it's a job, it's definitely doable. Once the bathroom fixtures and plumbing are out of the way, you remove the floor and focus on the frame. Once the frame is finished, you replace the floor utilizing a gap created by lowering the tongue and applying a bit of downward pressure on the frame rails.

Andy,

I would never work for less than $.50 an hour! And when making pizzas, I insist on at least $3.25! (and the cold beer doesn't count if I'm the one paying for it!)