We always tell new RV'ers to not expect to get "The One" Rv on your first try and to not go into serious debt with it either. Reason being is that RV'ers change. They change the type of RV they want/need...they change the size, the options, the style of camping. We started off in 2000 with a pop up. Had it for several years and then sold it because we were not able to use it. In 2010 we jumped into a 31' TT with a bunkhouse. After a few years, decided the setup was a waste to us and we would really like a motorhome. Traded it in after 3 years and got a Class C motorhome (31'). Now we are deciding we really don't need all that room and a smaller motorhome might make more sense for us. So we are now toying with the idea of a smaller Class C or Class A. And we are even considering dropping what we pay for it down also.
If you bought something that you owe more than what it's worth, then you either hold on to it until you even out, or trade it in and take the loss.
But we never have bought an Rv that we didn't like. We've changed our style of camping and needs/wants over the time. My boss is on his 4th RV (motorhomes) in about 3 years.