Yes I have tried the roller. You can adjust the roller to keep the chines off of the carpeted bunks while towing; but when launching and loading, the roller is not in contact with the boat. Again, it depends on the steepness of the ramp. Our ramp is 20 degrees; most ramps are at 12 degrees. Remember, the trailer does not float; It is on the bottom of the lake/ramp, and the boat is floating level, how could the roller be effective? They are to far apart. There is no contact between the roller and the boat.