I can answer the roofing question. The TPO will last better than "rubber". I am a commercial roofer by trade and deal with them daily. The TPO is more chemical resistant and more UV resistant that most of the EPDM (rubber). We have started the search for a B+ or a C. Currently looking at the Coachmen Concord. We like we see. On a used unit or new unit for that matter, I strongly recommend going over it with a PDI list
and then make your decision. We have been shopping for close to a year now, both new and used units. Getting close.
What I have learned over the years:
- Pick a floor plan
- Have YOUR list of needs and wants
- Pick a dealer you can work with
- Then choose the brand
- PDI is a must
FWIW this next purchase will be #10 or #11 in over 35 years.
Many years ago I would buy used, keep them for a season then sell them, usually at a profit. Now i am keeping them longer.