I am not sure about selling, but I had a great experience buying through a dealer with the RV on consignment. The RV, a truck camper, was very lightly used and just a few years old. I got the advantage of the high depreciation rate of a new camper plus no concerns about repairs or problems. The dealer and I went over the RV in great detail and he charged the seller for every possible issue. In addition I got a 1 year guarantee.
Perhaps you can work out an arrangement with a dealer to both buy and sell on consignment. You will lose depreciation on the sale but gain on buying used. Also I think you will find it difficult to sell and RV you are living in. Others might have more experience as to how well that works.
