Should I run or take a look at it??

Sold our Lance 815 truck camper and looking to purchase a Nash travel trailer. Looked at the exterior only of a nice 2007 Nash 22H 4 season today that is parked at a local RV park where it is stored. Owner said I could look at outside of camper since he was at work. Liked the model and the exterior looked in good shape but climbed on to roof to inspect. While the roof which is crowned looked solid there are many small black spots. The camper exterior needs a thorough cleaning for sure. Owner says the inside is excellent. Peaked into some windows and looked good. I also noticed that all the vertical seams and roof seams needed to be sealed and caulked. Dried and cracked. Spoke with owner on the phone later and asked him If he ever did any regular caulk maintenance on entire camper since he bought it new in 2007 and he said NO ?!!! Supposed to look at interior tomorrow. My Question is should I run and forget about this one??