There is the NADA RV Values site that you can use to value your trade. Unfortunately, it is very difficult to get a good value on dealer costs for RV's since the MSRP is seemingly a made up number to make customers think they are saving something by getting a discount.
Most dealers I have talked to want to give the low NADA for any trade, regardless of any improvements. Otherwise expect 20 to 30 percent off of the MSRP when trying to make a deal for a new motorhome.
As Dvan has said, buying used takes away some of the MSRP mystery as someone else has already taken on the depreciation hit from the first year or two. It is also possible to find the NADA values for those RV's after they have moved on to the next model year.
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