Call a RV Finance Company and ask the LOAN value. Like anything else you will get a couple of different answers. The bottom line is the value of a Motorhome today is what someone is willing to sell/buy a given unit for...Just check on one of the online sale sites and look at the varied prices of a given coach.
Sorry to say an individual values his coach more than a dealer and don't give a dealer the listed price. One dealer has a Journey listed for 119,000. Will drop to 109,000 on a cash deal and probably lower in real negotiations. Just bought the same model, year etc for less than 100,000.
The solution,,,shop, shop,shop and then when you find what you want deal, deal, deal. Good luck and Safe Miles