Just a point of information: GMC Truck states in its ads that it is the first full-sized pickup to feature four-wheel steering.
Actually, the Nash Quad, formerly the Jeffrey Quad, drove, steered and braked on all four wheels and had a rated carrying capacity of 1½ tons with a 20 percent overload capacity.
All the Quad trucks had four-speed transmissions that enabled them to go forward and reverse in all four gears.
The Quad was introduced in 1913 by Thomas B. Jeffrey Co. In 1916, the firm was taken over by Nash, which continued to build the four-wheel-steering truck.
By 1918, Nash Motor Co. produced 11,490 trucks. Most of them were Quads, and most went to the American government.
Many of the others were used in construction work and for delivery of goods in rural areas.