Just wanted to see the machine on the thumbnail but find myself watching the whole thing now lol. Pretty cool stuff here! First off, the Fendt Ideal is not used for Hay, its used for wheat, corn, beans, and barley, please get your facts right, They use haybines and Mowers for Hay.
Using stump removers is a bad idea in my opinion. For anyone that has actually removed many large tree stumps from the ground, you would be amazed to see how much tree material the tree root branches underground makes up. When these large roots eventually rot, the ground surface above sinks quite a bit. Anything you put on top, a roadway, building, bench or fence will have to be repaired after a few years.