I really want to thank the OP for this awesome write up. Upon fabbing these up I did run into a little problem with soft topper camper and the mounts for the canopy do not allow proper mechanical usage of my topper. I simply drilled my Hi-lift mounting holes 3/4" lower than listed above and everything fit nicely. Also, I see great benefit to using these types of mounts through out the bed rail system. I ended up cranking out a few extra of these mounts for my brothers taco. Thanks again!