Jackie, as people have said, be cautious but don't overthink this. Take the truck out after its initial start and put a few highway speed miles on it, but if the emergency brake was used when you stored it make sure it has fully released. As others have said, check battery levels, air pressure, oil and transmission levels, etc just as you would if it were a normal removal from storage. A can of silicon spray will likely come in handy as things will probably have dried out and a quick spray will help, such things as slide rails, electric motors, jacks and such.
You should look at all the propane orifices since spiders often nest at or in them. Since you likely don't have an air compressor, a can of compressed air used to clean your keyboard would work well, use it on the fridge, hot water heater, oven, and furnace. Do it before you turn on the propane.
