When I inspected the coach I looked for evidence of water damage inside on the ceiling and the walls and found none. This RV spent it's life in the desert and that was good as the caulking on the roof (vent seals, seams, antenna mount ) all needed to be cleaned and sealed before the weather turned cold & wet in Denver.
Here's the TV antenna mount caulk (Dicor) - on the right I have cleaned the caulk with mineral spirits an the left is untouched. You can see some small cracks that need to be filled with the self leveling Dicor sealant-

I removed the Max Air vent covers and found that the seller had mounted the covers through the roof instead of into the vent frame- this would be a source of water infiltration if not corrected-

Also, the above bathroom vent fell apart in my hands so I removed the old vent and Dicor-

And installed a new 3 speed, reversible vent - (has not been sealed yet in this pic) -

The view from the bathroom with the trim piece in place-

After that I spent quite a few hours completing the roof service. Lotsa stuff on the roof for this work-

good thing too as it snowed 2 days later.:C