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Change the oil.
Put Stabil in the tank and run it until you feel it is through the fuel system.
Consider a trickle charger for your battery.
Adjust tire pressure to the correct pressure.
Put on blocks if you desire.
Block any "entrance" into your truck that a mouse or some other varmit can use as it's temporary home.
i would just make sure that the battery is fully charged and then disconnect it. from my experiance in the marine business thats the best thing fer yer batt. a charger can boil the water out of it and caus it to go bad faster. just my $.02.