Run the fuel tank close to empty. Add some gasoline stabilizer and run the truck long enough to feed the mix through the carburator. Change the crankcase oil. Use API "SJ" specification oil in most cases. Grease all chassis points per lubrication chart. Lube all hinges, latches, and catches that could rust up during winter. Inspect fuel-system components, especially rubber hoses for cracking or softness. Sniff for gas leaks. Do this while changing the oil and greasing the chassis. Check fuel-tank cap. Check tire pressure. Make sure the transmission and differential have modern lubricants. Most can take gear lube of GL5 specification. This has an excellent additive package, including anti-oxidents, which will keep gears from corroding. Park vehicle for winter after a long run. Disconnect the battery.