A big thing on these old trucks is the brakes. especially the bigger 1.5/2tons. brake jobs can be a significant portion of the mechanical restoration. If one of these trucks has had known service or functioning brakes that is the truck i would lean towards. Rear differential lube condition ? can you pull the plug and drain a bit ? can you pull brake drums and have a look ? I would be picky about these things if you can be. How does the air and oil filter look ? Is there a drive shaft ? the more complete and functional the truck the better. Does the truck already have a 12volt system ? all things to consider
