Hello Neil & Lucy,
Very tempting as it is, clearly you have some misgivings about the prospect of a previously stolen/recovered caravan.
Unless I knew exactly what had happened in detail to the caravan, and any repairs that might have been necessary, I would have concerns, such as the ones you have already pointed out, but also, the sale raises some other questions.
Why is it being sold? If it has been recovered, then surely it should be back with its owners.
Who is selling it, and do they have full possession and the right to sell it?
It must be possible to find out what its CRIS status is, and also like a car you should be able to get an HPI check done.
If it is all above board, then it could be great bargain, but if you smell even a hint of rat - walk away.
Just out of interest, if you by a S/H product that is stolen or has some HP left on it. The rightful owner can repossess the product, and you will be left out of pocket. You would then have to sue the seller to get your money back, which if it is private sale may not be possible. At least with a dealership they do carry insurance against such situations.