Hi all, thanks so much for the responses, super helpful!!
It appears I may be incorrect about the model. It looks like the model may be the 36 DB since it has 2 slide-outs. The MH models seem to only have 1 slide.
Great news is that the family members we are dealing with are super helpful and trustworthy. Turns out the guy they had come out to work on the fuel pump was not their usual guy, and they decided not to go with him. They will be having the RV towed to their usual service guy within the next couple of weeks for a full assessment.
In other good news, it seems possible that the guy who is first in line to buy was hoping to have it sometime in July, and that will most likely not be happening. Hopefully he bows out.
I did climb up on top while we were there, and things looked great. As I said, this RV has been very well taken care of.
I'm planning on another $3-4k for tires ($2k), hoses ($?), etc. All the plastics on the inside looked good, but of course I can't speak to the brittleness.
Here's a non-helpful picture or two. Let me know if they don't display.