Specifications include, but are not limited to: 5.1 SIZE: Acceptable makes and models are as follows: Ford F150 4x4, Chevrolet 1500 4x4, and Ram 1500 4x4, or approved equal.5.2 GVW: The manufacturer's certified gross vehicle weight (GVW) rating shall be not less than 6,000 pounds. 5.3 WHEELBASE: The wheelbase shall not be less than 145 inches. 5.4 ENGINE: The trucks shall be equipped with a water-cooled gasoline engine having not fewer than 8-cylinders and a piston displacement not less than 4.6-liters. 5.5 TRANSMISSION: The transmission shall be of the 4-speed automatic type. 5.6 FRAME: All frame members shall be of proper strength and construction and in keeping with a design incorporating these specifications. 5.7 BRAKES: The trucks shall be equipped with power disc brakes on the front and rear and a mechanical emergency or parking brake. 5.8 FUEL TANK: A minimum 25-gallon tank shall be provided.