x2
Reese Sidewinder (pinned/wedge removed) and Reese R16 hitch. Hitch jaws catch king pin at the lowest point they can. Thickness of the lube plate lifts the king pin just enough where I don't get a complete and secure hitching.
Lube plate I tried was from eTrailer.Com. I called their tech support, was told the thickness, wrote it down but can't find it at the moment (and lube plate is in storage compartment of trailer ... in storage!).