I just studied the sales flyer a little closer and noticed that there were three configurations of the 1500 series produced in '54. A model 1553 with a 179" wheel base and a 16,000 lb GVW, a 1543 with a 161" wheel base and 16,000 GVW and a 1533 with a 137" wheel base and a 26,000 GVW. In the flyer they all just show the number 1500 below the Chevrolet emblem on both sides.