Heavy single frame cab and chassis with Allison HD4560P automatic transmission, 20K front axle, 46K full locking rears, T-Ride suspension, 425/65R22.5 front tires and 11R22.5 rear tires, 214" wheelbase, 150" C-T,, 18'6" of frame behind the cab (17'6" of frame behind the muffler), 5.38 ratio, and REPTO.