Except if the side of the truck says "U-Haul" or "Home Depot" people understand you're not the kind of asshole who buys and drives a fuckoff huge truck every day of the week.

Yes it would, because you wouldn’t need an explanatory note for the occasional rental. The note indicates he does this all the time.

Actually no, when I rent a pickup truck to pick up something I rent a standard cab one that actually still fits in a standard parking spot.

A 22 feet long pickup truck is the largest setup you can get with the huge cab and large bed. These used to be extremely niche. But nowadays, they've become increasingly popular because some insecure people can't cope with not having the biggest truck on the road, or people who really want a car they can move their family with but also want a large bed just in case they need to move something big once a year, which is, as I said, extremely wasteful.

The message he printed to put in his window makes it sound like he's a victim in all of this. But he chose to get a truck like that. That's on him.