I figured based on model #, the research could've been done by the OP if they were interested in a comparison to their 08 model's value.
I bought my '08 Keystone for $19,500 in 2007. The original MSRP was $28k. I got $10,500 in trade which was approximately what I could've gotten for it in great condition privately. There was a leak on the wall behind the couch and occasionally the door would leak around the frame. Otherwise, in the dealers words "it was in immaculate condition". I didn't want to sell to a private party due to the leak issues, so I traded it in. I got back what I owed on it, so nothing came out of the price of the new trailer, but I still got about 33% off MSRP for the new one, so I was happy. I just wanted the hassle of the old trailer gone and we were ready for an upgrade anyway.
I had actually agred to a lower trade in and slightly higher sales price at the RV show, but since we had to re-sign the paperwork 3 weeks later when we actually picked up the trailer, I Went ahead and did a bunch of research. I sent the dealer an email listing other dealers with better prices on the same trailer and I asked for a discount to match. they raised the price of the trade in and lowered the price of the new trailer to accommodate my request. If there is one thing RV dealers want, it's to not lose someone who has already decided to spend money with them. They still made some money on the deal and I walked away satisfied.