So wiring some lights on the back of my roof rack and just decided to ground the lights somewhere back there instead of running another wire to the front. I didn't really see any solid metal to metal grounds.. What has everyone else done?

 

I've found my roof rack and rails are insulated from the body and don't ground. However I use a good gauge wire (10 - 12) and go direct to stainless sheet metal screw thru the body. Door pillar is solid and my favourite choice, drill a 3/32 hole and hit it thru with a #8 or #10 screw, I like the stainless fasteners.