I am selling my 2009 Rockwood 8306SS TT and already had it listed below book value ($8,000) simply because it's in another state and I didn't want to mess with towing it. However, the potential buy...
You asked, "Is this delamination?" Yes, definitely delam. Most buyers would probably run...unless the price is REALLY attractive. If it were me since you do have a buyer, I'd negotiate some more and take what I could get and be done with it.