welcome to the forums good deal there just check the frame rails esepcially in rear at leaf spring mounting brackets to the frame rails and along bottom of the rails under front of bed and rear of cab they like to rot through here and this is what killed my '88 when the frame broke back there. i didnt realize it until i was messing around when i had the truck up on our lift and was poking around with a screwdriver and it went through the rail hmm..
a few weeks later it broke at the rear frotn most spring hanger and collapsed the frame rail, it was only 140k miles truck.
sure these run forever, as long as the frames dont rust and break
back in the day it was a common thing on other kinds of trucks too, i know someone here who had a full size chevy truck break in half while they are driving it, due to rusted frames
good luck!