There was a post on here somewhere, i think it was in a body lift thread,someone had to get to captured nut, and ended up drilling a hole with holesaw in a drill (from inside cab) through floor, to get to nut to carry out repair, as nut is between 2 sheets of metal.
I take it we are talking about the 4 bolts at rear of cab (2 left side and 2 right side).