What ISN'T bad for you in America? I'm pretty sure that if I died right now from anything, it really wouldn't be much of an inconvenience. Hell, trucking alone is dangerous: there are occupational hazards such as the exposure to diesel exhaust, prolonged exposure to engine noise, not getting enough sleep, the chance of your brakes failing and crashing into someone, something, or off a cliff, etc. Not to mention that it's also a sedentary occupation. I don't think that humans were made for constant sitting, and we all know that. This is something that doesn't require any type of study since it's merely common sense.
How about THIS for a study for those so-called researchers: Prolonged exposure to rainwater makes oneself extremely wet. Research and discuss.