This has been studied for decades. The percent of injuries due to collisions with SUVs or trucks really has no meaning, because it depends on the percent of SUVs or trucks in the population. But, the probability that a collision will result in injury, given the type of the vehicle, does have statistical meaning. If a car is struck by an suv or truck with a high bumper, the P of injury to a person in the car is very high. That hasn't changed in decades. What has changed is knowing what to do to reduce those injuries. What needs to change is the political will to do it.

The bumper-height regulation really should set a single bumper height standard for all vehicles, with a narrow range of allowed height, and with NO exceptions. Tall vehicles might look a little funny at first, only because we are used to seeing all that ground clearance below their high bumpers. And, after a collision, if one of the vehicles is found to have had an out-of-spec bumper, the driver of that vehicle should get an extra ticket and be held liable for any injuries in the other vehicle.

So-called "off road" vehicles could be designed with hinges so that the bumpers fold for off-road use. (But, operating them on the road in the folded configuration should be a moving violation.) In reality, something like 99 percent of "off road" vehicles are never operated off of established roads. My own "off-road" truck has never even been operated on a gravel or dirt road.