Ok lets get on the same page Racing96 ;)
I like the Roadmaster main mounting bracket , its held in place at the same location the stock one hence 3 bolts , the mounting bracket is against the box frame like an L shape , solid.
The STP main mounting bracket mounts underneath or above the ASB mount using only 2 holes for mounting and the rear bolt at least on the 2008 and newer is undersized , and easily stripped out the threads if not properly trq to specs. Even then by removing the bolt a few times will strip the threads out on the hole.
In my last post I was referring to the frame thickness on the video at 1:51 you can clearly see how thick or thin the Ford chassis frame is , and that's what is threaded for both sides holes to mount the ASB to.
I called and talked with Henderson's in OR. and he told me when they install a STP SS once they get the mounting bracket lined up and bolts tightened they put a couple spot welds on the mounting bracket/frame to hold it.
They have noticed that over time turning the wheel back forth has caused a few to loosen up.
My words NOT theirs I feel STP SS mounting bracket is a bad design , it should have been designed like the stock one or like the Roadmaster one.
One last thing , I find it odd that STP SS is mounted just the opposite of the stock dampner and the Roadmaster RSSC ? Kinda makes ya scratch your head thinking why ??