Portable toilets on the expressway

I think the practice of hauling portapotties on an uncovered pickup truck along a busy expressway at rush hour needs to be discouraged. And for the following reason. If I am gripping my wheel, staring tensely at the portapotty on the pickup, expecting, at any moment, to hear a flushing sound, and a man come out of it and climb back into the driving seat of the pickup, all the while doing 80 mph, I am obviously not giving a lot of attention to the road and its hapless denizens at that particular point in time. While no official records exist of how many fatalities occur every year due to these killer toilets cruising the streets of America, I am sure they must be considerable.