Think two manual transmissions back to back. The only way to get the 20 gears the truck needed was to give it two transmissions. So you have two shifters and have to take your hands off the wheel of a 35 ton rolling house that doesn't brake or steer very well. <img src="/images/graemlins/grin.gif" alt="" />

Eeeek! I had enough trouble with a 3 on the column Ford F100.

Like an old 10-speed, which was 2 and 5. Or more modern bikes are usually 3 and 7, for 21 speeds.

3-on-the-trees are fun! (Until they wear out and don't want to shift) <img src="/images/graemlins/mad.gif" alt="" />