Good advice has been given on avoiding a rusty rig. Listing a 5 speed could be a matter of interpretation. Does it actually have a H55F, true 5 speed (5 forward + 1 reverse), or a H42, 4 forward + 1 reverse = 5?
Great point here IMO. I have actually seen where folks list any manual as a 5 speed because thats what they normally see. Or they list a bunch of cars and all the listings overlap. Copy and paste from ad to ad and stuff gets mixed up or they really just don't know any better and list as a 5-speed. You get there and its actually just the normal 4-speed we would expect. Honest mistake maybe but worth confirming.
I did not see where anyone else offered this up, but I would take a vacuum guage and hook it up while the engine is running. You would be able to tell all manner of overall engine condition with one of those. Harbor Frieght sells a decent one if you don't already have one.
I'll echo what others have said here. Rust is a Land Cruisers Kryptonite. If the rust you can see is extensive, the rust you can't is prolly worse. Would need to be stopped. If you are not inclined to fix it yourself, or do not have the skills, that might get expensive and that would need to be considered in any deal you put together. But if the price it right it might be worth it to take a chance. I admittedly don't have the tools or skills to handle extensive rust myself so a rusted out 60 series was a non-starter for me. But if you do, then rust might be a non-issue, especially if the purchase price is right.
While conventional thinking says lower mileage trucks are a safer buy, If I had it to do again, I might have gotten one that had higher miles but lots more work done (mine was purchased with 170K on the clock). They usually cost more initially because of the low miles and can end up costing more down the road as many of the wear items that should be replaced haven't been. Unless you know the trucks maintenance history as others have said, you can count on replacing tons of stuff to baseline it. Anything on a 30+year old truck is ripe for replacing and with a lower mileage truck perhaps folks did not take the time to replace things that should have been done. The miles are low and nothing is leaking so why touch it? Age alone can take its toll on the various wear items on a vehicle like this, even if the miles are low warranting their replacement. If the seller has not done this, and if you are taking care of the Cruiser as it deserves to be taken care of, that cost all falls on you. Lots of coolant plumbing on these vehicles and the cost to replace just hoses on these can really add up. Ask me how I know. Lots of opinions on which way to go here. Hopefully you can get maintenance history on it. HTH.