It was quite common in the wake of McVeigh and other large vehicle attacks that they should be seen as weapons and licensing strengthened.

The fact you can drive a 26,000 lb GVWR truck without any special license is something special we have in America compared to most of say, Europe. It's actually pretty mind blowing anyone can just rent 26 ft diesel 26,000 lb truck and get in and drive it on the highway.

It is testament to the fact there are a few vestiges of freedom left in America. Not much, but a few vestiges, since such trucks were around before the regulation hysteria of the late 20th century and 21st century.