Take a change of clothes with you when you view and get under it!! Chassis rust or leaks an obvious start, take a camera and photograph any defects you not sure of so you can post pics and ask advice. Check MOT advisory history to see if issues been resolved. Give it a proper test drive, make sure fully warmed up and keep nostrils open for burning clutch or such like. Test everything!! Windows, air con, doors lock and unlock, transfer box change to low ratio......if you get a hint of any problems, dont buy until you are sure you know the extent of it. Some minor problems are no worries but can be used to talk price down of course. Good luck