This feels more like a political statement than a researched perspective. Is there proof that the F-150 of perhaps 2007 is smaller than that or 2012? Did the truck sizes change to become smaller once the emissions rule was revoked?
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F-150 13th gen (2015-2020) SuperCrew 6.5' length: 6,190 mm, width 2029 mm
CAFE is a huge driver of truck sizes and this has been known for many years. There is consumer demand in there as well, and once one of the big three go bigger the rest have to follow, but if the CAFE rules didn't take size into account it would be far, far harder for auto makers to increase the size since there is a fuel consumption penalty for more mass and frontal area.