i don't like the trailers that the ramps sit in slots. i have a 20' big tex. diveley trailers are also good for the price. i know several that are in service over 20 years.
http://www.econotrailer.com/index.html
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2007 Norwalk Quick 16 Winner 8.960 @152.24 8.96 dial
http://www.youtube.com/watch?v=8HY_nJR9Aa0&NR=1