Its not really possible to accurately price a caravan of that age. In reasonable usable condition with a dry interior, ie no body leaks, possibly £300-500
Your best bet would be ebay, reaches the widest audience, set the reserve for minimum you will take for it(but be realistic)& hope 2 bidders both want it as much as the other. Or you can put it on ebay as a classified ad. Not a good time to sell a caravan now though as its the end of the season. If you can keep it until about April/May & sell it then you should get more for it.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets