We were discussing how we name these GM based pickup truck with HD nomenclature at http://imcdb.org/vehicle_812494-Chevrolet-Silverado-GMT910-2010.html

An earlier generation HD pickup truck has no space between weight class and HD on the door. But, the later model did have a white space between weight class and HD on the door as well.

According to Truck_Guy, GM mentions them with no white space between weight class and HD throughout literature and its web site.

Comments and thoughts?