If you chose to get rid of the old one, I would advertise it on CL cheap or free. Someone will take it for a hunting cabin, etc..
Before you dispose of it (if you are capable) I would check the roof myself. Not quite two years ago I restored the original rubber roof on our 96 Southwind.
It was in rough condition but, Eternabond, Dicore Caulk and Heng's Rubber Roof Coating has it looking good and leak free.
It was not difficult, it took few days to complete and was worth the effort. I'll get several more years out of the original roof.