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Thanks Phil T for your advice...I just went and looked at my trailer...im not too sure that style you pic'd would work on my trailer...I have that style for the back 2 rollers, but this one in question is the front one and it's right where the trailer starts to "V" from the tounge...here's a pic of the setup the middle roller is exactly the same as the back one...They to me look like keel scrrapers too!!! I think I should go wider like the one you pictured, it looks wider than mine i have now..
http://i136.photobucket.com/albums/q1...CN0195.jpg
http://i136.photobucket.com/albums/q1...CN0193.jpg