It's probably not actually a U-Haul, I just couldn't think of the name of the type of truck and figured enough people have seen big U-Haul trucks that they'd be able to picture the size of truck I'm talking about.

Juneau has U-Haul. Maybe they take it back after delivery.

Long-term rental? I'm sure you can get a good deal on it, and since they don't own it, they can swap it out every week for another model, and if it breaks down it's not their problem. Or well it is, but it won't cost them much.

U-Hauls don't have to be rented, you can buy them: https://trucksales.uhaul.com

After you buy them with the logos removed, it is just a box van/truck.

I mean when you buy a Penske truck with the logos removed, it's just a yellow box truck. A u-haul is always going to have the distinctive shape, and they usually don't do a great job at removing the logos... They might have scraped off most of the logo, but they don't paint over it.

Not much incentive - the logo is essentially free advertising.