The T880 Super Dumps are more maneuverable because the truck, with a 256-inch wheelbase, is 40 feet long from the front bumper to the rear steerable pusher axle, as opposed to the 75-foot length of the tractor and end dump trailer units it replaced.Jul 28, 2016.. There are too many variables: body length, side/front height, cab protection, lift angle, the truck's tires and suspension etc. Just as a SWAG, a tri-axle will typically have 18' or longer body with 4 1/2' or more front height. It is likely to have 1/2 or less cab protection and maybe a 60 degree lift. With those dimensions, fully up it is.