There are farmers who join agricultural co-ops to do similar things. I've seen few operate differently - the co-op owns the machines and maintains a bunch of operators. These are requested by farmers who want work done - spraying, tilling, harvesting, etc.

The trouble is they all need them at the same time. In the UK you will see farmers in a break in the weather, all out testing the moisture in the wheat. As soon as it is right it is all hands to get it in on every farm before it rains again!