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Old 02-25-2016, 09:31 AM   #15
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All frames flex between hooked and unhooked. My new unit had too much flex, poor design, front cap removed to make repairs. With an older unit likely broken welds are the cause and must be investigated. There is greater stress on the slide out side due to less wall rigidity so this fail point is very common. Because the frame flexes up and down while towing, the crack can begin at either end, but at the slideout is more common because of the 90 degree cut in the Fiberglas for the slideout opening. Bottom line, root cause must be fixed or it will continue to get worse with additional towing with possible catastrophic failure while towing.
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Old 02-25-2016, 10:45 AM   #16
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Best help to minimize stress on forward frame is an air ride hitch or air pin box.
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Old 02-25-2016, 11:18 AM   #17
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My bet is a frame issue. I agree with others that say there is a deeper problem here. At least take it in have the frame and all welds near the pin looked at. Should not flex that much
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Old 02-25-2016, 01:01 PM   #18
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Just towing down the road will create much more stress on the frame and pin area. Static vs dynamic stress.
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Old 02-25-2016, 03:07 PM   #19
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I just read the most frightening words,,, BRING IT IN and let them have a look at it. I just envision the mechanics Dumb and Dumber pulling things apart looking for the problem at 100.00 dollars an hour. I know this doesn't make the OP happy but I'd try doing some investigating myself. Hopefully the cause will turn out to be something simple.

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Old 02-25-2016, 09:32 PM   #20
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It's not the weight of the slide causing this. It's a frame issue with stress caused when hooked up and the weight of the 5er behind the hitch. The crack gets larger away from the front. It will only get worse. Drilling a hole ahead of the crack won't stop it unfortunately.
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