Haven't done this in awhile, but this is where we used to buy corn for our goats. Took 3 drums in the back of the pickup and pulled up under the shute for them to fill it. Awfully lot of corn dust - had to be sure windows were up on the truck. You weighted as you went in and again as you went out, that's how they charged you.
I don't use that much corn now that I only have a few goats (though they're multiplying as I type). I buy it in 50 pound bags now.
My little pickup truck was so tiny compared to the huge trucks that hauled the corn to who knows where.