Buying a 04 honda f12 advice please!!!

Tomorrow im purchasing a 2004 honda f12 from a co-worker with 285 hrs. It comes with Trailer, Rear boarding step installed by Honda, 3 matching Honda life vest, a one person riding tube, flush kit, jet ski matching Honda cover, and the anchor all for $3,800.00. he wanted 4,000.00 but i was able to talk him down to 3,800.00. I need advice weather i should buy it or not? Im worried that the jet ski has too many hours, always used in salt water, the trailer has a lot of rust in the inside of the wheels and the springs. The trailer jet ski pads need to be replaced along with the mounting brackets but they are still functional. the jet ski itself has a couple os scratches on the top left side from the dock loading and unloading. There are also two 2 inch not too deep scrapes underneath the left side from where he parked it low tide came and it scraped along some rocks on the dock. Took the jet ski out for a ride and it rode great though great power great handling. He has all the records where Honda did the tune up on the jet ski every November. Is this a great deal or should i pass it up? Any advice would be appreciated. thank you.