A mobile tech recommends the use of them. At the campsite I met him at, he was replacing the plug at the rear of the trailer after the constant weight of the cord had damaged it and melted the wires inside the trailer. He told me it was about the 4th or 5th one he had replaced. Definitely dot Redwood specific.
Elliott & Vicky, and Sadie the GSD copilot
2014 36RE, Onan, Titan disc brakes, 17.5 inch Sailun H tires, lots of other options
2013 RAM 3500 CC, LB, DRW, Cummins, AISIN, 4x4