Does anyone use these on their tractors of trailers. They are so cheap and can make spotting a loose nut so much easier. Most lorry’s have them but never seen them on Agri machines. We have had tyres coming loose on trailers and tankers and balers and tractors over time and can damage rims and hubs. I can’t see when they don’t be used more often as a nut loosening could be spotted so much easier than checking all with a socket.