Unloading a tandem of wheat into the auger which is loading into a bin at the field. Harold has his equipment setup with wireless hydraulic controls so you can operate the equipment at a safe distance.
you may want to open the gate just a bit more,,running the auger fairly empty by the look and sound of it. Also you may want to check the flighting, bad shake in it by the look of that hopper.
Theweescot because the tractor is better for filling a silo. They can pull different tools and trailers and see much more of what is going on. The truck is just to carry the grain over. It's used to bring load after load and do what was done in the video numerous times. It is more efficient to fill a bigger container than to drive all the way to the unloading area and then back to the field... so the tractor can make runs to unload a full load of wheat while more is being harvested.
Theweescot a couple other things to add, the tractor has a PTO and that is used to power the auger. That's why the guy increased the throttle (in a way. Using the PTO draws more power from the engine). That is really the only way to put it in the silo. The truck doesn't have a place for an auger, so they leave the tractor there to fill each load into the silo.