Pretty much everything is available for the truck. Careful with what you buy, though. Many items need an inverter and if your company does not allow them, you've wasted your money. That said, you can find fridges, coolers, and even microwaves that are wired specifically for a truck without the need of a plug-in or hard-wired inverter. They are costly, though. Find out what your company will allow, then go from there.
Of course, if you're an O/O, then ignore everything I said.