Funny story - I'm reminded of a time years ago when a close friend of mine went to a garden supply store to pick up some gravel in his 1/2-ton Chevy PU. The loader operator puts in one pretty good sized scoop in the bed. My buddy eye-balled it and says "add another one." So in goes another scoop of gravel. My buddy eyeballs it again and says "one more, please." And the guy complies with the request. By then the truck is really hunkered down and gravel is mounded up over the bed rails.
My buddy starts for home about 5 miles away. After the first mile, he has second thoughts and pulls in to a gas station and adds air to the tires. The truck is still squatting pretty hard but he starts for home again. After another mile or so he stops again - looks it over again - eyeballs it again- and then start scooping the gravel off onto the side of the road. He unloads about 1/3 of it and finally makes it all the way home. He related this story to me when I came down to help him unload.
We later did the same thing but went by a scale with only one scoop in the rear of the truck. Turns out the one scoop weighed something around 1500 lbs.!!! So his original load was about 4500 lbs of gravel.

Most every time we passed the pile along side the road that he'd left, I'd ask him if he wanted to stop and pick it up. . . and surprisingly enough it aways got a smile from him . . . !