That post might just be worded wrong, but dirt tends to be a little heavier than it looks, more so than gravel and golf balls since you can put more of it in a equal space. Because of that, people often mis-calculate the weight of the dirt that they are hauling, when compared to that last load of gravel/golf balls that they hauled. Plus dirt can also hold a large amount of weight, depending on the concentration of water held in it.
Maybe this is the reason it is so hard on trailers??
Where would you haul 10 tons of golf balls, other than maybe at a driving range? I would hate to be the one to have to pick those up by hand. Glad they make golf ball harvestors.
David from jax