Depending on the state you live in and your insurance company look into some form of "farm rider" or "farm equipment rider".
Ours covers virtually everything "equipment" not otherwise covered under homeowner policy---tractors, mowers, hand-power-, shop-, and machine tools, farm trucks, implements. We've got everything scheduled out and the only thing not listed are the barn cats.
Owner must pay attention and continuously interact with Agent as operations expand, contract, or change (buy, sell, rent equipment). Document everything. Keep photo records of everything. Little things like photographing roofs every six months can make a big difference come the next claim.
Be certain you're covered for being driven on road or highway, trailering, transport, and if on neighbor or local land-not-your-own (trading labor, community contribution (cleaning a ditch, spreading gravel at fire station, citizen roadside trash pickup day).
Try bundling all your insurance needs with one company for a better deal.
Insurance like lawyers and real estate agents are generally low-level scams but have become necessary in order to survive the modern world.