If I was you I would pay for an inspection, this would work out cheaper in the long run.
or get yourself a damp meter and check all the walls ect, check the floor is not springy.
would be best to pay for it to checked out this is what I would do.
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If its a 2008 model the balance of the 6 year water ingression warranty will be transferable providing the van has been serviced annually and on time .