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How long is it out of service for? If it's six months or less I'd just disconnect the battery and pump up the tires. If it's more than six months, but less than 18 months I'd also drain the fuel, put in fresh coolant, and do an oil change before I put in away. You might also want to wash it, wax it, and put a car cover on it to avoid "hanger rash". Check it periodically to make sure that no "critters' are taking up residence inside (pack rats are a pain here in AZ) and keep the tires inflated. If it's more than 18 months I'd either sell it or prepare it for long term storage (seal and dessicate the engine). I would not run it as that just contaminates the oil without much value to the engine. I would not go through the trouble of jacking it up as the suspension is designed to have the weight of the truck on it for its entire life. I might move it once in a while or jack it up (but not leave it on jacks) to rotate the tires to avoid tire damage (sidewall cracking, delanination).
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