Have a new 5er and looking to install the JT Strong Arms on it. I've been trying to find more information about the connection to the rear electric stabilizers (Ground Control 3.0). Lippert says I need 2 x $59 adapters (#314592) for the rears, but I can't figure out what they do or where they connect. Some say screw on, others say weld on....does anyone know the truth? Is there anything at Home Depot or Amazon that can do what those $59 adapters do? Seems ridiculous they don't come with.....