Regarding your question... you didn't provide enough purchase information to make a reasonably educated decision on purchase price. You could talk to 10 different dealers and get 10 different prices; all trading does is muddy the waters. However...
By trading you automatically give the dealer the opportunity to make money off of you twice; on your trade in vehicle and on the MH you purchase.
Sell what you have outright and apply that cash to the purchase of your new MH. Decide on what you want to buy, in your case a Winnebago. Call the MH manufacturer and request a "Buy" order sheet listing the MSRP of the MH and all available options. Select the options you want, add the MSRP price of the options to the MSRP price of the MH, total it, deduct 35%, offer that price and order it, or walk if they don't take your offer. Someone will take the offer. You'll at least reduce the dollar amount beating you're going to take on purchasing a new MH. Good luck.
Happy camping!!! See y'all down the road!!!:)