41’ foot frame length Electric tarp Stockpile or windrow Watertight; no leaks Low load height Dumps toward either side Steel Tub, One Piece Floor 80/100 KSI Steel Frames Self-Aligning, Spherical Bearing Hinges External Column Tub Supports No Center Tub Divider SmithCo’s S2 Tandem Axle side dump trailer is one of the most popular and versatile models. The S2-4034 is the most commonly produced size for tandem axle units, and with a 204″ wheelbase tractor it can achieve 80,000 legal gross in all states under the Federal Bridge Formula.