Damaged seats can be recovered or replaced, but they might be a negotiating point. Examine cleats and other deck fittings carefully. They should be bolted through the deck, not screwed into the fiberglass, and backed with wood blocks or metal plates under the deck. Crawl under the boat and examine the trailer carefully. Make sure the tongue-fitting attaches and releases easily from the trailer ball, that trailer rollers turn smoothly and that the wheel bearings have been serviced.
Prices vary dramatically.