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Old 07-06-2015, 08:46 PM   #1
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Fifth Wheel frame flex

Hi Guys,

First post so be gentle

Just back from our maiden voyage with our new Chaparral 29BHS. Really love the unit. When we pulled into the campsite we noticed that the driver side bedside wardrobe skin had popped off. Originally I though no big deal just a few brad nails and I can fix it but.... When we lifted the jacks and put the weight back on to the hitch the bulge re-appeared. Seems the weight of the camper on the hitch is flexing the frame.

I mounted my gopro to the passenger side window and went on down the road, it was really crazy to see how much flex there was just driving on a freeway, I can only imagine how bad it would be on a country road.

I have an appointment with the dealer but am curious to know how much flex you guys have experienced with your 5th wheels.

Working on getting the video edited so I can upload.
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Old 07-06-2015, 09:23 PM   #2
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Frame flex vid

Struggling to get this video to upload
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Old 07-06-2015, 09:24 PM   #3
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This is not normal. It looks like a weld is bad. I would be looking heavily at your king post and weld areas. There has been past post that show this. I'll look too..
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Old 07-06-2015, 09:27 PM   #4
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Some areas you may look at;


Cracks in 5th wheel pin box to frame


Help! Metal sheered off our hitch/pin box? (pic included!)
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Old 07-06-2015, 09:31 PM   #5
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Here is the vid uploaded to youtube


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Old 07-06-2015, 09:46 PM   #6
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Very good way to document the issue. Hope you can get it fixed...newbie here so I have no suggestions or theories. Will be interesting to find out
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Old 07-06-2015, 09:54 PM   #7
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I really don't think it's frame flex. I think the panel was cut too large and just swelled from moisture/humidity. I think you would see more evidence of frame flex if the cabinet joints to the ceiling or floor were separated. JMO.
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Old 07-06-2015, 09:58 PM   #8
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Telling sign would be the grope looking at the outside including the pin box. Then we could see frame flex between the pin and the frame.
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Old 07-06-2015, 09:59 PM   #9
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Your video looks like most trailers do as they travel down the road...

Good Luck !!!

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Old 07-06-2015, 10:01 PM   #10
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I measure the pinbox 1/2" upward pinbox movement when lowering onto hitch.


Old Coot the cabinet skin returns to normal when trailer is supported by the landing gear
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