I've had my TC for a few months now and am getting better with load times. I found that if I get it close at the back, I can center it perfectly by having someone push on the side in the last inch of lowering it. An even easier way is to use 2 air bags (the type used on car doors for lock outs) between the TC side and the rail.
The part I'm still struggling with is nailing the front spacing (side to side). I can get within a couple inches, but it seems like there should be some method to adjust that last little bit. Anyone have recommendations?