Curious, I was under the impression Happijac didn't start the "frame mount" until early 2000's. Our original HJ mounts, dealer installed 2001, didn't have the frame mount, maybe an option.
Though I never understood how a bent piece of flat bar, bolted thru floor and its formed sheet metal cross member could be described as frame mount.
![](https://i.imgur.com/RtmTfPn.jpg)
Given weight and planned distance the Brophys adequate. The pocket style seem stronger using the pocket structure (and bolting thru sheet metal). The clamp on style might be less damaging to truck if reselling a consideration. Pockets style would be my choice but Brophys site states 2011 and newer not fitting?
https://www.crbrophy.com/tdhd.html