Thank you for letting me join! We have a 16' Glastron open hull which we trailer on a gal. EZ Loader. They were bought as a pair in 1988, when we purchased them. Yesterday, for the first time, we have encountered issues on the boat self centering when we took it out of the water. I cannot remember any maintenance that should be done concerning the rollers on this trailer? Does anyone have any info on this? Thanks again!