I think the number of large trucks on the road is very dependent on location. I'm in the Deep South, and they are everywhere. I'm actually one of only two people at my job who don't have a giant truck. The other is my boss. Coincidentally, we are also the only two women who work here. She's got an older minivan, and my car is 15 years old. Oh wait, one guy drives his girlfriend's Jeep. I forgot about him.

Include SUVs in your computation and rerun the numbers. Yes, the big fuck off trucks are still a minority, but they push everything bigger the bigger they get. And bigger is the only thing they're getting.

I drive a MINI, bought it in 2018. Then, I was comfortably in the majority of car sizes (new minis are comfortable hatchbacks). Now, there's maybe 10% of cars that I'm comparable to, everything else has windows with bottoms that are at or above my roofline.

It's a combination. And even though those trucks might be a minority on the road in the US, the percentage of those monstrosities is still more compared to in europe. Over here they are a rarity. I bet if you compare those percentages to the percentages of accidents with fatalities that you see a similarity.