A dual wheel axle with a 5' round beam is standard. Four tires on the ground provide maximum stability, yet the dual wheel configuration greatly reduces the scuffing and punctures associated with a tandem wheel arrangement. The Main Frame is of 14" wide flange beams in an "H" configuration. 1/8" thick tread plate form the top and sides of the 6' by 6 1/2' platform. The tongue is the strongest in the industry - strong enough to carry 3800 lbs of tongue weight.