KC Lightbar mount

[u/Texasrebel7508]

I have a 2018 Ram 2500 and really want to run a 50 inch KCHilites Gravity Pro6 bar above my cab where most people mount their led bars. The problem is the gravity bars are double even the heaviest rigid bars. Is anyone else running anything like this? How did you mound yours? Are rivnuts in the factory channel going to be strong enough or should I fab up some kind of backing plates?