I'm not worries about a fire, but I have mine wired separately. That way you can turn them on any time you want. Besides, the lights I put in my bumper are way too bright to be used as reverse lights. They'll blind people.
Evo Coilovers, King Shocks & B-stops, R Dbl Throwdown System, 5:13, RE Driveshafts,
Rock Hard Skids. Viair Tank, LoD F&R Bumpers, PowerPlant, 3 Oddessy Batteries, Pro Comp 8128 17"
BFG T/A KO 37s, MasterPull Syn, sPOD, OTRATTW Switches, 12VOLTGUY.com Switchpanel, Woods Evap & Muff Relocate, Tailgate Holder