+ Is the caravan waterproof? Check for watermarks and rust on the interior. You may need to silicone rivets and joins if there are any small leaks.
+ Is the structure solid? The more rust or dents there are, the more you will need to spend to get it looking good.
+ What condition is the interior in? You may need to reupholster squabs and add new flooring, unless you are planning to gut the caravan and refurbish it from scratch.
+ Are the windows in working order? Check that these open and close, and seals are intact. + Will you need power in your caravan? If so, you could have it wired from your house by an electrician or have them install solar panels to make it self-sufficient.