How used is it? Things you should do to it when it arrives.

TAKE IT APART!!!!!!!!!!!!!!!!!!! And check for missing screws.
CHeck all the gears, and make sure they are in good shape and greased correctly. Make sure the shocks are full of fluid and work properly.

Take the engine apart and clean it well with some carb cleaner, and a air hose if available.

Once the truck is back together, stick some new fuel line on it with a fuel filter. Set all the carb needles back to factory, and start like you are breaking it in but skip every other tank until you get it tuned for your area. These are just a few things I do when I buy a used car.This saves alot of frustration later on!!

Now if its a new truck, break it in per the manuals instructions, and have a blast!! Later