I actually rent a car for transporting stuff (mostly big stuff to the dump/disposal). The savings on fuel alone during the year make op for that easily.
I've been toying with the idea of getting a hitch installed on my Prius.
Here are much smaller (10x and smaller) taxes on vehicles, that is probably the reason.
I also doubt you are taking fuel into account with this comparison, which was the primary source of savings mentioned when you own a small car and rent a truck as needed.
Large trailers (if they’re big enough to be worth hiring instead of a van) will for most people likely need additional qualifications on their licence to be allowed to drive with so they’re less popular.