I would put the truck up on stands
inspect everything underneath
exhaust system
brakes
fuel lines
electrical
frame
axles
suspension
driveshafts
lighting
steering
hubs
cv joints
then get in the engine bay
most likely you’ll need all new rubber everythig and everywhere
tune up plugs wires distributor
all fluids flushed. Brakes, coolant, power steering , axles,
filters changed. Fuel, oil air.
when you buy a vehicle that old and if it went through a few owners most likely it’s gonna have each owners special custom touches or ideal of repair or neglect.
rarely do you buy a old car that’s been meticulously maintained. I would check everything. I bought a 1995 S500 from a. Family member and it’s a creampuff. But I still ordered new coolant hoses, fluids and filters. I already checked everything else. There is nothing wrong with the hoses and filters but if I do it I know it’s done and I don’t need to guess if it needs changing