Probably going to get flamed for this, but weight is weight, doesnt matter if its sand or horses. You will have to admit, there are always going to be drivers that cannot handle the vehicle with the weight they are carrying. Even CDL drivers that cant backup, cant handle their vehicles. People hook up a pickup to a trailer carrying horses or whatever and drive the thing like they are in a car. Just yesterday followed a SUV, not a pickup mind you, capable of the weight, pulling a horse trailer, stuck out in the left lane, trailer swaying all over the place, going too fast downhill and dragging uphill. Never dawned on the driver to move over, slow down and drive like they had some sense. Put everyone near him and the horses in danger.

People never realize when they are too tired to drive, so before anyone says it, Ive had my CDL A since its inception. Driven times when I shouldnt have, just older and a little wiser, hopefully.

Just my opinion.