Wow! If that $39 was for front and rear that's a deal. Provided, of course, that they did a good, thorough job.
I drilled completely through the beams for most of the mounting bolts, and used bolts, washers, and lock-nuts. In a couple of places that I couldn't get to the other side I used the self-tapping bolts and they worked okay. They got tight and are still holding.
They really did lessen the amount that the toyhauler moves around by a considerable amount. I don't think I would have another 5th wheel without them.
Howard and Peggy
"Don't Panic"