[RyanS]

If you're planning to use the Super Shifter, AndyMark now sells a hex long wheel shaft.http://andymark.biz/am-0519.html It sticks out 3 inches longer than the standard shaft so you can attach hex broached sprockets (to drive chain to the outer wheels)and a hex broached wheel directly to the out put shaft. I've attached a picture of a west coast siderail. The material towards the outside of the wheels is bumper support. Hope this helps.