 So that weight distribution during tests shall vary little if any, two fuel cells of rubber construction and total capacity of 20 gallons, are located on either side of the "CERV-I" at approximately the fore and aft location of the center of gravity.Thus, the amount of fuel in the tanks at any given moment will have virtually no effect on weight distribution.Brakes on the "CERV-I" are similar to the HD type available on the Chevrolet Corvette.