I use a couple of those coated cable locks:
one keeping the trailer to the truck, one keeping the side by side to the truck, and then take off a random tire. I kept the tire hidden so I don't have to bring it in the hotel. Is it overboard? depends who you ask but these days people would steal anything not tied down.... When I was in the military/stationed in California we even locked spare tires and utility attachments down for field exercises because locals would try to sneak off with stuff. no one reads the "military exercise in progress, live ammo blah blah signs" anyways.
Could always just remove the battery and use chain/cable to lock it down etc.
Orange 17 Teryx4 LE, 4.5k winch, Full windshield, Roof, quadboss front rack, full size front spare tire/wheel