We just bought a used 2007 Puma TT.
The one lesson I learned is to check the roof and or slide out roof, insist on it even if you have to bring your own ladder.
Even though our interior looked factory fresh, the previous owners let the TT sit with no preventative maintenance to the roof.
I still would have bought the TT, but the condition of the roof would have given me some haggle power to get the purchase price lowered.
REPAIRED ON FRIDAY (Roll of SticknBond and a tube of Dicor, about 85.00 dollars) Still need to buy the gasket for the torn gasket you see in the photo.