> Maybe you’re noticing when there’s one human but you don’t really know how else that person is using the vehicle at other times.

95% of big trucks I see on the road have one person in them and beyond my anecdotal experience we know statistically that most vehicle trips involve 1 person. It's not super hard to extrapolate from there.

I'm not even particularly "anti" truck, though I do think the increase in size and weight has gotten totally ridiculous.