Can I get some feedback on these specific sliders. I am a big fan of the design but the body mounting concerns me. I spoke with BA and their tech informed me that they are designed to mount to the body due to body twist and noise 'squeaking' from frame mounting. They also advised me that their sliders are stout.

 

I have them and I like them for the main purpose of my wife can use them as a step. I have heard a couple different stories that makes me want to run bracing from the frame to the rock slider as well. There great because they are wide, but because there wide the rock hits hard enough it has leverage to bend the tub floor.

There are other threads out there for you to get better idea