Sailed a few hours today. My trailer has 4 rollers. Each roller assembly has a 6 inch vertical guide post attached to the outside. These posts each have a roller covering them, but when Pulling the boat out at the end of the day, one of the rollers came off and caused some damage to a hull

So it's time to chuck the rollers for a better set-up. I was thinking some pressure treated 2 by 6 lengths, and screwed onto that maybe a length of 3 or 4in diameter pvc cut in half lengthwise(a U track of sorts). I'd like to hear some alternative suggestions on effective, inexpensive, boat friendly, tried and true methods for trailer set-up. I sure would appreciate the benefit of your experience!