I have a 16 foot aluminum deep V console fishing boat. I have a shoreland'r roller trailer. Ever since I bought the boat it always loads an inch or two to the right side of the trailer. Even when you winch it up you can see the bow come to the right of it and you have to put pressure on the strap to keep it centered in the winch. It always centers in the bow roller just fine but the rear is always shifted to the right side of the trailer and inch or two. I took most of the trailer apart to paint it this spring and put it all back together. I measured and made sure the roller bars where even. On the front cross member there was a skid pad(so to speak) that it rode up on. It was kind of hard to winch when the boat would get that far so I replaced the pad with a roller in front of the member and one behind. You can see that the keel is always just a hair on the right side of the center groove on the rollers. I am not sure what I can to do fix this. The trailer loads great otherwise.