I'm new to MC trailering. My used PiggyBacker came with a lock for the trailer coupler. I have used this on the coupler while riding so no one can just pull up with THEIR Wing (or Panigale or V-Max :lol and take off with my Pig. Please forgive my ignorance but I just wondered if the coupler was, perhaps, SUPPOSED to be able to come loose under extreme conditions. That probably sounds like a stupid question, but trailering has its own set of rules--for example Safety Chains make no sense to me either.