Many years ago I saw a newbie operator dump a Bob cat on it's face. He was loading a dump truck and he had the loaded bucket all the way up before he was even close to the truck. Don't know just what happened but he probably just tried to stop his forward travel and it was enough to cause the thing to tip forward to where he was looking straight down. He unhooked the belt and came out the back window, wouldn't get back in it. I pulled it back over and on it's wheels with the backhoe/loader tractor I was operating.
The pictures of the tipped over trailer should be a reminder that we need to have at least 60% of the weight forward of the axles. I rode in a crew cab with a guy that was pulling a trailer with a Bobcat loaded bucket first, tail heavy trailer that started swaying side to side every time he got over 45mph. I was just a kid back then and had no idea why this was happening but it scared the heck out of me, thought for sure we were going to roll over. The driver was a kid too, a bosses son, and just couldn't resist the urge to try to go faster and we went though the oscillation thing each time. When we got to the shop I asked an old hand why the trailer was getting the side to side oscillation and he told me we had the weight distribution too heavy on the rear. Always loaded the back first after that, made the trailer stable and the machine kept all the wheels on the ground going up the ramp.