I think in the context of this discussion heavyweight is defined by Section 179 as having a Gross Vehicle Weight Rating greater than 6000 lbs. While the curb w

I think in the context of this discussion heavyweight is defined by Section 179 as having a Gross Vehicle Weight Rating greater than 6000 lbs. While the curb weight of a F150 is less, the GVWR is 6,010 to 7,150 lbs.