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Old 01-14-2019, 07:19 PM   #1
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Sidewall crack study-whatís your setup?

There seems to be a lot more members who have experienced the sidewall/stress crack of late. I do not believe there to be any correlation between what setup you have and your likelihood of getting the crack. As an unscientific study, I would like you to state your TV, hitch (when crack showed up) pin box, airbags on truck?, and how long it took for the crack to develop (time or miles) to see if we can find some common thread for those with cracked sidewalls.


2014 Ford F-350 with airbags
Curt Q25
Stock MorRyde pin box
About a year(less than 6k miles)
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Old 01-14-2019, 07:28 PM   #2
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I'll start, but I don't have the crack....yet!

2016 NP 377

Started out towing with a Ram 2500 with Firestone airbags set to 55 PSI and a B&W Companion hitch with the Moryde pin box for approx 1 year and 4k miles.

After 1 year of ownership I switched to a Ram 3500 DRW with factory airbags and same hitch. I've towed approx 2 years and an additional 7k miles.

I added the Sailun tires after about 9 months.
I added the wet bolt kit and brace approx 1 yr into ownership.
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Old 01-14-2019, 07:34 PM   #3
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Dan

Youíre really trying to jinx yourself, huh?!
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Old 01-14-2019, 07:42 PM   #4
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Quote:
Originally Posted by Magnolia Tom View Post
Dan

Youíre really trying to jinx yourself, huh?!
I'm hoping not to!

If anything could be causing the crack, it could be those stiff as concrete sidewalls on the tires. When I upgraded to the Sailun's I had all kinds of things break inside the 5er.
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Old 01-14-2019, 07:48 PM   #5
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Quote:
Originally Posted by Bookemdanno View Post
I'm hoping not to!



If anything could be causing the crack, it could be those stiff as concrete sidewalls on the tires. When I upgraded to the Sailun's I had all kinds of things break inside the 5er.


Thatís why I added the shocks
I also dropped my pressure to 100-105psi
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2014 Ford F350 Platinum sold
2017 Ford F350 Lariat, CC, 6.7PSD, DRW, Trailer Saver BD3 hitch

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Old 01-14-2019, 07:52 PM   #6
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Picked up our 2018 KPTS in October 2017. Towed it approx. 5K miles between November and May with 2014 F-350 dually with factory installed Reese Elite 25k hitch and aftermarket airbags. In early June 2018, took it to MorRyde and had 8K Independent Suspension and disk brakes installed. Later in June, at the Jayco Rally no less, found the crack. In July, replaced the Reese hitch with a Trailer Saver hitch.

Trailer goes to the factory in April for the crack repair.
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Old 01-14-2019, 07:53 PM   #7
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We had a crack on our 2012 Eagle 321RLTS, bottom left of the bedroom slide with a Schwinteck slide. The crack had to travel about 2” under the Schwinteck trim before it could be seen. After it was visible it travelled another 4” diagonally. After I lifted the trim I saw it origionated from a screw hole. I surmised it was as a result of not pre drilling the hole and over torquing the screw. Jayco refused to repair it, being out of warranty by 6 months or so. Two failed attempts to repair the crack by local people. As soon as it was hooked up to the truck the crack re appeared.
2005 GMC Sierra Duramax 2500 HD 6’6” box
Firestone Riderite Air Springs
Reese 16K
MORryde Rubber Pin Box
Crack appeared 2 yrs+, more than 20 kms (12,427 + miles)
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Old 01-15-2019, 08:29 AM   #8
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Interesting that the small sample size shows 3 cracks from trucks with airbags, 1 airbag equipped truck not cracked.

Not sure how airbags on a truck could be the cause...
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Old 01-15-2019, 09:05 AM   #9
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Quote:
Originally Posted by Magnolia Tom View Post
Interesting that the small sample size shows 3 cracks from trucks with airbags, 1 airbag equipped truck not cracked.

Not sure how airbags on a truck could be the cause...
I think it may be caused by a "twisting" action. A question that could be added to the mix is, "Have you had problems with the leveling system?" I've had read outs about "excess frame twisting" or something to that effect. Just a thought.
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Old 01-15-2019, 09:11 AM   #10
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I've never had to use more than about 35#s of air in the bags to level up the truck. Don't know how that little amount of air could be a contributing factor to the crack issue.
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