That looks like a good way to haul and unload hay.
Quite a few years ago, I bought a semi-load of small square bales of hay. At that time, we were still stacking our hay in loose 4-5 ton stacks (with a farmhand loader). When this live-bottom truck came with the load of small square bales, he backed up to a hay stack to keep the back bales from tipping over. Then he just drove out from under the whole load, and it came out perfectly stacked. His truck looked very similar to the one in your pictures.