The secret of non-rattling is in this swedge-style block. By tightening the bolt to a specified 75 lb-ft, it wedges itself into the 2-inch receiver. The included instructions are very well thought out and use actual words. Needless to say, we didn’t go to 75 lb-ft the first time—who actually reads instructions the first time? We went to “tight.” The carrier rocked in the hitch until we tightened the bolt correctly.