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I looked at mine to see the manufacturer but my extension is a heavily built home made model that came with a cabover camper 20 years ago. I kept it when I upgraded the camper. Mine happens to have a plate that runs underneath the hitch extension that through bolts to the truck hitches chain holes. On any of the extensions, even ones used strictly for launching, I would set up two tightened chains on either side of the vehicles hitch to prevent swaying.

Garris