Yes Brian, there are a number of other holes that my double wall attaches to that were not used. The slotted holes were actually filled with some sort of paste that I had to dig out with a screw driver to get to. When I put the hard top back on, I'll have to figure out a filler or something to tighten the internal nuts to avoid unnecessary rattles..
Chalet, Thanks for the complement. I've had it for 6 or 7 years now and haven't had a chance to do much to it. Next is some type of Rhino lining, then 4" lift w/ 35's and posi/456 gears.