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The most succeptable units are the 70's 31 foot units with the rear bath and the 4 inch frame. The rear bath models have the tanks in the rear. Ones with both gray and black water tanks might be worse, if the owners traveled with alot of liquid in the back. Units that have had alot of travel over rough roads or have spent alot of time by the oceans would also have had their frames weakened. I think the earliest 5 inch frames appeared in the early 80's but were only found on the 34 footers at first.
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