On a toyota bed, the mounting bolts do not go through the floor of the bed, only the channel that is welded to the bottom of the floor. there is JUST enough room to drop the stock bolts down through the holes. A 3" or longer bolt will never go in.
As an added suggestion, I would reccommend using Nylock nuts on ALL of the bolts that are installed with the head down. If the nut loosens for any reason, the bolt can drop straight out. If the nylock nuts loosen (from vibration, flex...) it will not vibrate off of the bolt, so it will remain connected.
Very good write-up RS.
P.S. If the e-brake cable gets tight, there are several clips where the cable goes over the transmission. open the one at the top of the tranny tunnel and pull the slack from there. (the tranny is no longer in the way)
