Many years ago we were driving on a mountain road and saw little military style Jeep approaching down a long grade toward us. He was about 200 yards from us when he started veering back and forth with increasing severity. We saw a way overloaded utility trailer intermittently jutting out from the jeep at extremely crazy angles. The Jeep's tires
were actually lifting off the pavement, and I thought I'd better get off the road. I went onto the shoulder and watched fully expecting the rig to roll over. Somehow he got it reined in and came to a stop. (probably had to change pants) I'll bet he learned how to load a trailer that day, or at least how not to load one! It seems many utility trailers have the axle
placed dead center under the box. That invites a person to improperly load it, like that guy in Home Depot. I have built many trailers in my lifetime, and all of them had the axle
placed a distance behind the center. The placement was done by the scientific practice of dead reckoning. All of those trailers functioned without ill manners and were intuitively easy to load properly.