A closer look at the complexities of the "Pederick" tandem hitch arrangement.

A much later and improved tandem hitch design, by a company called Holland. These Holland hitches were based on a ballrace turntable (similar to a "fifth wheel" on a semi-trailer), and these hitches were simpler and lighter than earlier design tandem hitches. These tractors are 6-354 Perkins powered "C6100" models - with the model number referring to 6 cylinders and 100HP.