I figured I could be a little more helpful and measure my 55 4400 for you since it's in the back yard. It looks very similar to yours. The wheelbase, from the outer part of the front tire to the outer of the rear was 16". The rear measured 7' from outside dual to outside dual and the front was 6' wide. Hope that helps. My truck is in the 55 gallery.
Matt Droege
tri5trucking
