I have bunks with centering rollers. They have plastic liners, so I figure they really don't need to be greased. I have run the boat up a few times, and it works, but I don't always have someone with me to help out. I can do it on my own, but prefer someone to go get my trailer while I drive the boat up. Anyway, I just decided I prefer to dock my boat, and float it on, then winch it into position. Seems to work best for me. I have a summer boat, and don't mind getting a little wet. Even if I want to run it in the Puget Sound, I can always just wear my waders.