Best Inention for the wheel since wheel:. 12R225 can be mounted and demounted from carrier in 10 seconds with minimum efford. Three safety features to hold wheel to carrier.. Mounts to truck and trailer easily. Can be used for 6,8,10 hole wheels. Special lifting bar to fit 1 meter high if needed. No crawling or working under truck or trailer.. A 1 man operated without a chance of injury to operator.