they are all a huge investment. Even if you find one with 150,000 miles figure all the rubber parts are 20 years old. PM still includes, all coolant line, vacuum lines, belts, many gaskets, brake lines, cap, plug, rotor, all fluids. Brake pads and rotors are well worn by 150,000. So if they have not been done then they could need doing on any of these trucks. Wheel bearings packed or replaced and so on. not to mentions springs, shocks and so on. Sure some things might be better on a 150,000 mile truck over a 250,000. Birfield, tie rods, and interior are are some of the things to me that likely to be better with lower millage. Exterior is a individual truck thing. My truck with 184,xxx had pealing roof paint. I am not looking forward to learning to do paint work. Obviously a engine and transmission with lower mileage SHOULD be better than a high mileage one. But i think that depends on maintenance, PO care and driving habits. My transmission shifts beautifully with 200,000. I figure if i keep it full of god clean oil it should be good for a long time. My engine purs like a kitten but i am using a little oil. I have a few leaks to address but it might need valve seals. Thats just life.
My point is these things are old and since they are so reliable most owners have NOT done PM. Depending on what type of reliability you need will depend on what you do in the way of PM. In one year of ownership i a three page typed list of PM done and a BOOK of receipts of OEM Toyota parts. But i needed my truck to be as reliable as possible. I will be regularly driving from Georgia to Wyoming and in other remote areas.
Back to your question. The mileage you list is a little higher than I WOULD WANT. But that is only because i want to put a lot of mileage on it so i want a lower starting point. But it really matters more on the individual truck. Be prepared to fix or replace LOTS of small and medium ticket items such as suspension, brakes, and rubber parts. What i would not want to fix is transmission, engine internals, leather on seat (just cover seats or live with what you got) and paint. But i am mechanically inclined and can do all my own work. So this affects my decisions. For example rebuilding a front axle/berfields cost me just parts.
but this is all just my opinion. Buy the nicest one you can and be prepared to do a lot of neglected PM. Most PO only replace what brakes!
