Newbie seller need help please!!

Treat the deal, as has been suggested to you, as if it's two deals. You are selling you're item to someone, you are buying an item from someone. In your case, the offer from the dealer for the Jayco will be on same page as the price of the Avenger, but you'll still have prices for two different units to consider. Get estimates from another repair shop to repair yours. The Jayco is new enough to find some identical models, get prices for used, undamaged. Deduct the repair amount from the cost of an undamaged Jayco. The Avenger sounds new...30% or more off MSRP is about the norm. Most Jayco's have good resale value.