Keep the camper. It is a part of you and worth more than just the money you will get for it.
In the Eric Bana documentary "Love The Beast". They talk a lot about cars (in this case a camper) being more than a object.
"It's what non-car people don't get. They see all cars as just ton-and-a-half, two-tons of wires, glass, metal and rubber. That's all they see. People like you or I know, we have an unshakable belief that cars are living entities. Not like a Toyota Carolla obviously, but a real... You can develop a relationship with a car. And that's just what non-car people don't get. Charles Babbage, the inventor of the computer in the 18th century talked about the unerring certainty of machinery. Ok, now the problem you have with the unerring certainty of machinery is that it is a machine. When something has follies and won't handle properly, that gives it a particularly human quality because it makes mistakes. And that's how you can build a relationship with a car that other people won't get." Jeremy Clarkson (Love the beast)
If this sounds like your camper then keep it.