This is our first fiver, which may explain what I'm gonna tell you.
Our well meaning, mis-informed son-in-law, greased the 5th wheel plate on the Rullrite Superglide. Today, after a LONG trip, I cleaned the ENTIRE hitch using a good degreaser. That includes the "tubes" and the capture plate. It looks like new! The mechanism moves smoothly - again. I was very surprised to find so much grit everywhere!
My hope is anyone who is also new to 5ers will inspect their hitch before the next trip. You may be surprised at what you find!