Oh yeah, I member!
I specifically member when this came out, how little sense it made. You had to buy the FX2 package and some specific set of options to get the Tremor logos...there was (at least at the time) no Tremor package to select.
It was a neat idea, but you had to buy way too expensive a truck to get it. Should have been a $25k-ish vehicle and wound up as a $35k truck.