The author makes a correct observation (trucks are getting bigger to circumvent emissions guidelines, not solely out of ego), but fails to address the underlying market demand: as trucks have gotten bigger, they've also gotten "meaner"[1]. Emissions requirements don't require a truck to look like it's going to beat you up.
In other words: consumer ego (wanting to drive a big, mean looking truck) is an underlying pressure in the market, even if the sufficient mover for the current size explosion is emissions dodging.
[1]: https://jalopnik.com/we-need-to-talk-about-truck-design-righ...
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