I definitely would not pay 16 grand for one, maybe 12 or 13, and only if the floor was solid.
The new ones, which are a completely different camper, and far nicer, can be bought in the high 20's.
If you are not worried about the weight, I would avoid the Rockwood altogether. The Wildcats are built better, as are the Cougars from Keystone.
It is good that you are patient, as you will probably find a great camper at a great price that way.