Too bad you don't live closer. I'd help you with your floor project.
We bought a used 8283SS a month ago. We too have been looking for quite some time.
It's an '06 with all we were looking for except a slide topper, which I can always add later.
Rear living, Atrium slide, Free standing table & chairs and a few other amenities.
I located it in middle Texas. It too has low milage. I'm towing with a 1/2 ton also.
I started doing a few mods and will most pics later.
Good luck with the flooring support. Wish I had taken pics of our job.