The main reason they became so gigantic is regulation. First, since "heavy-duty" vehicles are subject to less regulation, crew cabs demand soared (much cheaper

The main reason they became so gigantic is regulation. First, since "heavy-duty" vehicles are subject to less regulation, crew cabs demand soared (much cheaper than a regular car with similar room). Then, during Obamas presidency, fuel consumption standards were based on wheelbase and tread width. This meant that larger trucks had to be less fuel efficient, which meant they were cheaper. If all vehicles were subject to the same regulations the size increases would have been in line with normal cars. If there was a lot less regulation and people weren't demanding so many gimmicks, you could probably get a very basic work truck, about as big as a Hiluxe, for $5k.