omfg I would love that. Like literally force manufacturers to put air brakes on anything above a certain weight limit and demand additional certification to operate one. Full Disclosure: I own four vehicles that would trigger this requirement, each for different reasons, and would be whistling and smirking in the DMV line to take the commercial test.
A commercial driver has a physical every year, severe restrictions on how they can drive, hours behind wheel, etc. But if you have 2 cataract surguries, oncoming dementia, and a body full of arthritis that can barely move, you can drive a 50' Class A Motorhome to your winter home in the South.