RV price tags can be all over the charts depending upon age and condition. Condition is more important than age when it comes to purchasing a used RV.
My advise, what's the selling price worth to you? What do YOU want to get out of it. Figure that out, put the price tag on and see what happens. And, as long as you are satisfied with your own price tag, (and you get it), then whatever anyone else sells them for is not important. You got what YOU wanted. That's really all that matters.
If you put a price tag on it and it does not sell, lower it in $100 increments until it's sold. In all reality, if your camper has served you and served you well, and you got your value out of it, then even giving it away is an option.