The T680 was launched at the recent Mid America Trucking Show. Sister brand Peterbilt shares the basic cab construction in its model 579, also launched at the show. Both are highly tooled stamped aluminum with complex panels joined by Henrob fasteners to create a rigid aluminum cab structure. The rivets are blind and no heads stand out on the smooth cab surface except at the rear corners to aid repair there. In this, the T680 falls between the T660 with its largely exposed Huck-bolt rivets and the smooth aerospace bonded structure that is underneath the sleek panels of the T700.
