Sarah,
Well, congrats on getting your
Burro. Always something to fix or tweak on these older campers, but they tend to last & last.
I have a
U-Haul CT, so pretty similar... I guess I'll start the responses to your question about floor issues. Others will probably chime in later.
I commend you for sealing up the topside of the floor with the reinforced & waterproof filler. This undoubtedly firmed & leveled things up some. Did you use some
Fiberglass resin as well?...... I ask that because it looks shiny all over, but maybe you just 'feathered it out' over the whole surface?
Another question: Was the floor 'dried out' thoroughly?....... what I'm getting at, was this
old leakage that softened the floor in spots, but whatever caused the leakage was dealt with, and the old plywood had a chance to dry out?
If not, that could cause problems later on.
All that said, there's not too many 'absolutes' about having an old camper, so if it enables you to get out & camp & use it, that's probably good. I'd just suggest not permanently attaching whatever plywood you put over top... just let it 'float'.
I had a few sagging spots in our
U-Haul camper, old leak damage, and only one was still a bit moist---near the door. After removing the carpet etc, and before installing new, I put some additional drains in those low spots, so if water ran there again, it could get out. [If you were to do that, be sure and seal all the 'raw' edges of the holes.] I'd replaced all three back
windows, and the roof vent, and caulked underneath the clearance
lights on the outside of the camper shell, so I didn't think water would still be getting in... but the additional drains felt like 'insurance'.
Sorry for gassing on so long... old guy syndrome.
Best of luck with the
Burro,
Gary