NEW Aspen 20 ton tandem axle hydraulic relief ECU auto shim booster. 14'1 spread. Split booster with (2) pin off axles. 54" axle spacing. All aluminum wheels. 22.5 radial. Drum brakes. Jerk chains/pin up on each axle. Designed to go with the 65 and 75 ton Aspen E-Series trailers. Drum brakes. Oversize sign and frame included. Configure trailer to run 4 in a row, 5 in a row, 3 +1 or 3+2. Black in color. Weight 9,472 lbs +/-3%.