That is the way it is with motorhomes......depreciation is a killer. Obviously, if you sell it outright and go make a cash, no-trade deal on a new coach, you will do better.
A better option, IMO, is to shop for a nice, gently used, well-maintained DP. Sell yours and take your time and shop carefully. All three of our motorhomes were used and no regrets. Some folks just have to have new but to me, it is just throwing money away to buy new and take the huge depreciation hit.
You can find a bunch of late model used DP's that are neglected, for sure. However, if you take your time, you can find what you want in great condition. Another postive is with a used coach (assuming the prior owner was diligent in taking care of things), you don't have to deal with the frustration of de-bugging the new coach.
'07 Country Coach Allure 470 Siskiyou Summit #31578, Cummins ISL 425; 2014 Ford F150 toad; Air Force One Toad Brake.
Glen Allen, VA; Smith Mountain Lake, VA.