I've never driven a truck. I don't know if the insurance price of the truck is more expensive, but the insurance company won't see if you pulled the goods on your car in an accident. But then again, there is a cargo box behind your car, and the minibus can't get a license plate.
The qualification certificate has nothing to do with insurance, and it doesn't matter who drives it. When dealing with accidents, only look at the driving license and driver's license.