Voltage isn't what you need to know. Everything on the truck runs on 12v DC or less. What you need to know is the draw in amps. Then check the gauge of wire feeding the circuit against the total draw for your existing lights (what the truck cane with) and the new lights, and compare all that to the fuse on this circuit. Otherwise you could keep blowing fuses or possibly overheat and melt the wiring, starting a fire.
You're probably fine, but prudence says do some electrical homework and be sure. Probably is of no comfort when your truck is on fire.
You're probably fine, but prudence says do some electrical homework and be sure. Probably is of no comfort when your truck is on fire.