How many kilos of sand and stones can be loaded by a cart on a construction site?
Two wheeled car general 100kg or so, more than it is difficult to push.
Carts may vary from place to place. The 2 wheeled carts used in Hubei carry about 170kg of sand and about 180kg of stones.
I suggest you use the soil or skip baskets a car -- try first called empty basket, then filled with sand (or stone) weighing two value for subtracting a basket of sand (or stone) net weight, then the basket (sand or gravel) to see the car, installed a total of how much a single basket, basket net is a car (or sand stone) net.