To find out if *your* specific truck has a block heater, you should:
* Check the engine compartment: Look for a cord that plugs into the engine block near the oil pan. This is the most direct way to tell.
* Consult the owner's manual: The manual will specify if a block heater was included as an option.
* Look at the truck's build sheet (if available): This document will list the options included with the truck when it was manufactured.
Without knowing the specific truck, it's impossible to say for sure.