Without knowing the wiring configuration on the truck, there is no way to know if it will be safe. A relay harness configuration should address those concerns. Fuses/Breakers should keep you out of trouble however, if the proper ratings are used.
A lot of lighting regulations are managed on the state level, so you will need to look up your specific state laws.
The big thing to remember is that the laws are there to protect you, and other drivers. If you do any mods, you are on your own, and do them, and use them with your fellow drivers in mind. If you are driving at oncoming traffic with quad beams, and auxiliary driving lights all running, than you deserve what'* coming to you.