not positive, I'm sure others will know more than i, but I think that the message Rover was trying to send was that their trucks were tough enough to do the job right off the showroom floor.. It was my understanding that the trophy trucks were all stock except for the added accessories, i.e. winch, roof racks, etc.... why would they use hd suspension parts while using those "bicycle" tires/wheels that they all had!?! maybe heavier springs for the extra weight?