Not exactly on topic but a curiosity question. Years ago when the Dallas Cowboys built their Irving stadium they nearly shared parking lots with Yellow Freight which at the time had the largest freight dock in the world. As we walked to the stadium they had impossibly short tractors spotting trailers up to the docks. Just a single cab like a crane or drag line and gearing so deep that the Detroit Diesel in them would sound like the truck was doing 70 when it was doing 17. Those spotters were GOOD; each trailer had 1" distance between it's side marker lights and the trailer next to it and each got stopped about 2" from the dock and all done at a break neck speed. I've always wondered if these were shop made or if a company made them with the cab, hydraulic 5th wheel,etc.

Evan