The two main reasons for your truck to just stop are

1. Lose of fuel, Cause : plugged fuel filter ,bad fuel pump break in fuel line, lose of power to the injectors .

2. Lose of spark Cause: coil failure, battery failure ,alternator failure, wiring failure ECM failure

If you want me to be more specific then I need more information on what happened and what the truck is doing when you try to start it