I followed the poor direction provided. It said to use a half inch drill bit and use expantion nuts. A half inch hole is way to big for the small expantion nuts provided causing a real problem. I ended up drilling clear through frame and attached the front of bracket. I was unable to drill through for the back hole in bracket due to cross member on KRK. I had to run to hardware store and buy some better made expantion nuts. I was able to tighten the back bolts downe but if the lightbar takes a hit from a branch I am not confident it will stay on. Light looks nice but needs better direction and get rid of the part where it tells you to use a half inch drill bit.
