I bought a Swift Corniche from a dealer ( the type that only trades in secondhand vans) once and despite having had over 10 years experience of caravans, still failed to spot the problems, The CRIS check passed no problem. I was curious as to why things like the alarm and the door flyscreen had been removed, and it was obvious that the nearside front locker had been repaired with fibreglass. Other than that, looked perfect.I took it home , washed , polished , did everything. Looked brilliant but I was still nervous that something wasn't right.Side panel looked "wavey"
A caravan mechanic friend looked it over and in about 2 minutes demonstrated that the van had been in a typical jacknife accident. It had gone over on it's nearside, the panel had been "overskined" but it was suffering from water ingress as a result of a cheap repair.There was evidence of where the floor had been repaired over the offside wheel. The van had suffered a blowout , jacknifed and gone over. It took him 2 minutes to show me what I couldn't spot in 24 hours. Fortuneately, the dealer had not sold my van and agreed to return it along with the cash.I had a very worrying time until the cheque cleared.
In summary, not being bothered about make, only wanting a fixed bed suggests that you have not done much homework.
Beware, you could be an easy target.