Only guess on pilots is heat attack.

But Truckers? Come on that's a pretty easy one to figure out. Traffic deaths are probably the majority (most cop deaths are traffic deaths, not getting shot). Truckers also work around large moving trucks, and forklifts that have a massive solid steel counterweight on the back that will not notice when is grinds your pelvis into hamburger against the nearest warehouse column or concrete loading dock.

Garbage men also spend a lot of time on the road(traffic deaths) and are constantly working around equipment that also won't notice, even a little bit, when they tear off a limb or crush a whole body.

Don't be an ass, try thinking sometime.