I have 1 2007 Tahoe bowrider type boat but this is a pretty general trailer question anyway.....when I drive on the trailer, the roller by the wench does not seem to roll properely and is scratching up the pretty blue gelcoat right there by where you clip the strap to the boat....it is a factory trailer for this boat, it looks like a typical three pc roller, one smaller inner and two larger but the out side ones don't seem to turn and it's scratching the finish.....are they supposed to roll?