Dealers always low ball trade-ins. Has the dealer seen your unit? Was it "front line ready"? Front line ready means the unit has been completely cleaned inside and out, and reconditioned all broken items have been repaired etc. and the unit winterized. Make sure the roof is clean and all seams resealed. To the dealer time is money. If they take in a trade that requires even "normal" reconditioning it can cost them thousands of dollars in time (can't sell a rig that is in the shop and money (direct for reconditioning and repairs).