Feels like this part should be explored more.
There's a problem - cars are getting bigger and there's a lack of infrastructure support. People are buying bigger cars for some reason. Is it actually necessary or is it just marketing at work?
The author assumes the larger vehicles are a natural progression and bases most observations on that.
For /some/ subset, not that I have any percentage to quote, the bigger vehicle is possibly necessary. I.e, contractors who need a large pickup truck to haul building supplies/tools to/from job sites.
But I've always personally felt that most (as in some value above 50%) of the /trend/ is simply a combination of "keeping up with the Joneses" [1] and marketing at work.
[1] https://en.wikipedia.org/wiki/Keeping_Up_With_the_Joneses