I have State Farm homeowners. My personal items are covered under my homeowners even if they are stolen from another location such as the barn, my horse trailer etc… If a particular item was over a certain amount ($10,000 at that time) then I would need a rider for that item but that applies to any item over that limit such as tools, jewelry. Since I have no one single item worth over $10,000 there was nothing to add to my policy. I had a very long discussion with my agent about my tack since I board and it is kept at the barn. I did not have to provide any details regarding security measures at the barn. I have actually moved barns a few times since then.
Interestingly I spoke to someone that is a sponsored rider. Her homeowners/renters insurance will not cover her saddles if they get stolen. Since they are actually on loan from the sponsor she does not own them. Since it is not her property and it is somebody else’s property that she is allowed to use and possess it it not covered under her homeowner/renter’s coverage. She was State Farm too.
If you are borrowing a friend or relative’s saddle that gets stolen things could get muddy quickly.
Therefore I would talk to your agent and get it in writing as there can be subtle differences in policies and the ownership of the item that may make a difference in coverage.