the nut is about a quarter inch off the rim. I have a gusset in the back an made the whole thing out of 1/4 plate. I would suspect I will hit part of it, but not likely the bottom of the shock at least.
I took it out for a test today and it sure is fun. just a desert road that has a few bumps. The rear is defiantly valved stiffer then the front, but its working really well.