Because the modern truck has crash safety in mind due to crumple zones and other shit. I bet if a small truck were to be redesigned today with modern collision technology it would be just as safe as the truck without being multiple tons heavy to the point you nearly need a cdl license to drive a behemoth
Kei modernized their truck, it still scores a zero.
Maybe research first…?
Check how much worse it is for the pedestrian to be hit by the pick up truck.