Front and rear sway bars

[ChallengerHK]

I had thought about welding the nuts on the inside. Might work. The biggest issue I see is that for a good, tight joint you need long, thin bolts, and the bolts holding the sway bar mounts are short thick bolts, just the opposite. They don't stretch as much, and bolt stretch keeps the joint solid.

[cudazappa]

Other than reinforcing the inside of the frame rail (cutting it out, adding plate steel with holes drilled inside, welding it all back up for a seamless look) I don't see a really clean way to do it correctly.  When it's rear sway bar time for me (late winter) I'll just weld the brackets to the frame.  Won't pull off then!

[ChallengerHK]

  that was the conclusion I finally came to as well.