We took our Jayco pop-top to a dealer when we were considering an upgrade, and were very disappointed in the trade-in amount they offered. So we have decided to keep it a while longer. I wish you lotsa luck with your purchase.
Maybe have a look at what caravan like yours is selling for , Then try selling private through newspaper , sign on the van or maybe Ebay , Once it is sold you can look at buying what you wont, maybe 2nd hand that is no longer required