Thanks for the correction. I see now, it’s a larger car chassis - so as @empireOfLove2@lemmy.dbzer0.com said, that’s not a “truck”, light or otherwise, at all!?

I did a search and found this article suggesting that it is a historical (hehe, some might say… “legacy”, eh?:-P) naming scheme, based on fuel economy:

The U.S. government uses light-duty trucking as a vehicle class for the regulation of fuel economy by enforcing the Corporate Average Fuel Economy (CAFE) standards. The light-duty truck class includes pickup trucks, sport utility vehicles (SUVs), vans, and minivans.

Since light-duty trucks are typically used for utility purposes rather than personal use, they have lower standards for fuel economy than cars do.