You are a Gent, I'll have a look at them..
no worries - the best bit of advice i can think of is if you have a mate that knows about landys take him, it could stop you buying a crock of ****e. its one thing looking at photos but another seeing in person
if you dont, ask here if someone local would care to join you on your buying trips. as long as you offer a pint and a packet of crisps im sure someone would be more than happy to help!
if you dont know what to look for a duff chassis can look decent with a coat of waxoyl, a rear cross member that needs replacing can look remarkably good with a coat of paint, and a bulkhead that totally shod can look half decent as well.
so if you know anyone take em, they can point out if its duff
if all else fails, look for rust on the bulkhead, if you cant see any look for paint bubbling, a small amount can be sorted but if theres a fair bit it means theres a bigger underlying issue than perhaps it seems.
check the chassis all over very carefully, and especially the outriggers.
take up the floor mats in the interior and have a look at the floorwells, they are liable to rusting away as well. and the rear crossmember, if it has a towball stand on it, short of you being a proper fat **** the crossmember shouldnt flex or move at all
check for any leaks near the engine, there is likely to be a small amount, its a land rovers in built rust protection, but anything more than a drip on the ground and you need to investigate further.
also if you can take it for a drive, check for vague steering, whining from the diffs or gearbox, and try out low range, check the lights come on for difflock etc etc - as that can often get seized if it isnt used
oh, and if you can at all help it get one without a sunroof, they leak like buggery