What kills any of them is water and eventually any of them will have water intrustion. Grease is also your friend. As someone else said, just rotate the entire jack in the coupler. If you want any of them to last throw a Homer bucket over them to keep them dry when stored or at the campground.
The cheap FIC on our 2017 Rockwood is still going strong on its 3rd season. I figured Id be replacing it in the first year or two seeing they can be found for less than $100. Its attached to an even cheaper coupler assembly that can be had for $12 with no adjustable pawl, so you have to typically beat on it with a hammer to get it to release lol.
