I silicone greased mine when replaced. Mostly to keep the seals in place while I assembled them. But after that the grease helped make the slide smooth.
Edited to add the word silicone
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2001 Suburban 4x4. 6.0L, 4.10 3/4 ton **** 2005 Jayco Jay Flight 27BH **** 1986 Coleman Columbia Popup