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Talk to your local law inforcement department, or firedepartment. If your "legal" to have them, they will point you to the shop that does their vehicles. You will then have your answer.
I guess your a volunteer they are usually the only ones that have lights on there personel vehicles. Why not just get strobes in your headlights? If not that just hook up to your battery with a fuse between the lights and battery and mount a switch inside the truck!
Relay. Don't ever power lights through a cab switch...
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Using a relay is usually safer and protects your equipment. If you are just using a switch you are drawing all that amperage thru the switch. Most switches are not intended do that. If you use a switch with a relay all you need is enough power to turn the relay on and off.
Kev


