I am not currently using one on the game, because I find them quite odd, too narrow, and too tall. in one shot! 60k pounds plus it can hold of grain. My grandpa has a Brent 1282 grain cart and damn there fills the semi right up.
The grain cart is super useful where I am at, because semis are not able to catch up to combines quickly or go in the rough conditions in fields and they are manuals, plus, you can see better when you are using a tractor and cart. No joke, because the only way of grain hauling is gravity wagons, Wilson/Timpte truck trailers, and grain carts, and that's it. In America, we call them Grain Carts and roughly everyone uses one in Iowa.