I think he was talking about something like Bal Lock, or something like that, that go between your tires, tighten up and both lock your tires so they don't roll and stabilize your trailer as well, not scissor jacks for the rear of the trailer.
2012 GMC 2500HD D/A Crewcab
2012 Jayco Eagle SuperLite HT 26.5 RLS
2009 Crestliner Superhawk 1900
2013 Polaris Sportsman 550 EXP
2008 Polaris Sportsman 700 X2