Hmm, just googled it and you are right. They are so we don't monster truck over other cars. Interesting.
2017 Power wagon owner here. Accident in Dec 2017. That is how I know. For the record, they don't work all that well. Everyone was ok for the most part, however, if anyone was in the back seat of that car, they would have been dead. Truck went through the trunk and all the way to the back seat in a Lexus. That is how I know. Not boasting by any means. I am sure that there is a study somewhere where these worked, but in my case, the front bumper pushed the car down far enough that these brackets skipped over the bumper frame and through the vehicle I went.
No one in my family will drive a low riding car if I have any say so- this was a real eye opener. And the truck was 100% stock with no modifications. And no I wasn't texting and driving ... LOL.. was the result of coming over a hill at highway speeds and everyone was moving drastically slower..