A high-hooded truck or SUV is far more dangerous to the public than a small car, and a small car is more dangerous than a motorcycle, so a speeding ticket/liscense points/jail time for an SUV should be >4x more severe than a motorcycle doing the same violation, and bicycles should basically only recieve token fines.
The point of impact is higher. Low points of impact break your legs and let you roll over the hood, while high points of impact break your spine.
Visibility is also limited in those kinds of vehicles.