I think 2003 was the year they dropped wood and started using a steel frame and more aluminum. In 2003 they also moved the AC on most models from the back shell to the front shell, changed to a low profile AC, moved the spare under the trailer, and changed the bumper style. My 2003 (3124) has the AC in front and the spare under the trailer, but a standard height AC and an older 4 inch square bumper. A friend's 2003 (3023) has all of the above changes, so some of the changes must have come during the model year. So a 2003 or newer will eliminate a lot of the wood rot problems of older models and include the newer design features.
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