IMO, the *real* reason for commercial licenses was the concept that commercial drivers are driving much larger vehicles that require special training/skills to operate safely on the roadways. (Your average licensed driver can't just hop into an 18-wheeler and operate it.
Exactly. That's the same reason people should be required to have commercial licenses to drive pickup trucks. They're much larger vehicles than regular cars, and need more training to drive properly. From what I've seen of most pickup truck drivers, they obviously lack the necessary training and skills for driving 6000-pound vehicles, especially ones with dual rear wheels.
A vehicle anyone buys at a regular car dealership and uses as a "daily driver" for things like commuting or trips to the grocery store should NOT require a commercial license.
Yes, it should, if it's a large vehicle. If someone buys a Kenworth and uses it for grocery runs, should they not be required to get a commercial license? It's no different for a Hummer. If you want a vehicle for getting groceries and commuting, get a 4-door sedan like everyone else.