I bought this wheel chock through a Canadian dealer a number of years ago. Its made out of HOLLOW tubing. Yes I was surprised when the front loop broke off at the plate. It must fatigue over time bending slightly on each use. My bike is 800lbs and the wheel was a tight fit. Fortunately my other tie-downs and bins at the front of the enclosed trailer minimized the damage. My top case took the worst of it rubbing on the back door.
I recommend not to buy this chock or if you own it get it beefed up at your local welding shop. The manufacturer said they would send a replacement but never did and would not return my emails. I am new to the forum so hopefully I can post pictures otherwise I'll send them to you if you email me