Twin steer, double frame cab and chassis with 42" flat top bunk, 37,500 lb. front axle and 46K full locking rears, Chalmers suspension, 425/65R22.5 front tires and 11R24.5 rear tires, 340" wheelbase, 218" C-T, 24' of frame behind the cab, 368" bridge, and 4.30 ratio. Currently set up with a National Crane.