In the US, trucks got so big because of poorly-thought-out EPA regulations that mandated specific gas mileage based on hood height rather than tonnage. In order to be subjected to the lower, more achievable targets, the hood height has to be above a certain number or else the truck can’t be sold.
Can you share a source for the hood height regulations? Never heard anything like that before.
I’m not sure about the hood height part, but CAFE (US fuel economy standards) loosen the MPG requirements as vehicles get larger. The curve is poorly made and it is simply easier to increase the size of the vehicle and hit the looser fuel economy requirements. The regulation with the goal to increase fuel economy…encourages larger vehicles with worse fuel economy.
