get a curt 7 pin adapter with 5 pin harness - its covered in these forums under adding reverse lights - it all steals connections off the trailer feeds.
but the post on pg 1 - dude says:
"All the lights are daisy chained together and I ran the ground of the led's to the driver side fender where there are a couple of ground bolts. For the 12v power I initially wanted to tap into the parking lamp wire behind the headlight but found it hard to get to(not a lot of room to probe for correct wire) and thought it was quicker and easier just to run a wire back to my from my curt T harness that I used for my tailgate bar in the back and tap in the parking lamp wire of t-harness to supply the 12 volts when the parking lamps are turned on."
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the trailer feeds off the 5 pin or 7 pin are strong enough to run some lights. if you are gonna run BIG lights, i suggest only using the trailer feed as a trigger wire for a relay and use fused battery power if you are gonna power some big *** lamps. if you are gonna actually hook up a trailer ever you may want to unhook any adds you have added also, so the trailer gets the full juice.
you could toggle switch it, but if you use the trailer pin feed, it will be on via whenever your usual lights are on. im about to do this myself to my own rig.
front license plate holder