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Old 07-27-2021, 12:10 PM   #1
Jeff B Florida
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Question Rear exterior Fiberglass panel flexing 2019 Keystone Bullet 287QBS

I am new to this forum. I have a 2019 Keystone Bullet 287QBS with the exterior rear panel that is flexing someone mentioned to me that it indicates water penetration and damage Is that true?

Also looking to repair the area above the tires due to 3 tire loss, 1 last year on driver side and 2 this past June on passenger side.

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Old 07-27-2021, 01:14 PM   #2
chuckster57
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Welcome to the forum

Often times the rear wall is “floating”, meaning it’s only held in place by the top, bottom and sides using staples or screws and the rear window if you have one.

If you can, post pics of the damage so we can better try to help.
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Old 07-27-2021, 03:52 PM   #3
Jeff B Florida
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The dent below the right hand rear clearance light happened this past trip. When pushing on the back pane it flex's inward. It does not appear loose along the seams.
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Old 07-27-2021, 04:28 PM   #4
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I have to ask; how do you lose 3 tires on a 2019 trailer? Are you keeping them at max psi? Hitting potholes etc.? Are they overloaded? I've not had that many tire failures in decades much less on a 2 year old trailer.
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Old 07-27-2021, 04:41 PM   #5
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The side walls are "vacuum bonded" and feel solid. The rear wall is "hung in place after the trailer sidewalls are installed. If it were also "vacuum bonded" the costs to provide bolt locations to install the rear wall would increase the costs. So, Keystone uses a "partially built wall, the interior luan is glued to the aluminum frame, the wall is then put in position and there is access to the aluminum frame to bolt it to the side walls and the floor, then insulation is installed and the rear "skin" is installed. It's held in place along all 4 perimeters by molding screwed through the FILON. Any windows, ladder mounts, tail lights and if installed, a bar-b-que rack all screw "through the FILON to help secure the rear wall to the frame. When the sun shines on the rear wall, it gets hot, expands enough to make it "bubble, droop or bulge enough to make it appear "loose".

Here are a couple of photos of the rear wall being installed on a Cougar at the factory. In the first photo you can see how the "rear wall without FILON is installed, then as the trailer moves down the line, the FILON is hung in place and trimmed to fit the roofline.
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Old 07-28-2021, 04:28 AM   #6
Jeff B Florida
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Tire area damage

sourdough: I am not sure what caused the tires to fail. The tires were kept at recommended pressure and never driven when low due to cooler weather. They also did not sit with low pressure when stored.

I just found out this year that the area above the tires needs to be repaired and maintained. This was after I lost two tires on the passenger side. The trailer and truck was not overloaded.

Thank you for the information on the back exterior wall.

19 Keystone Bullet 287QBS
F150 FX4 w/Tow package

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Old 07-28-2021, 06:04 AM   #7
sourdough
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Quote:
Originally Posted by Jeff B Florida View Post
sourdough: I am not sure what caused the tires to fail. The tires were kept at recommended pressure and never driven when low due to cooler weather. They also did not sit with low pressure when stored.

I just found out this year that the area above the tires needs to be repaired and maintained. This was after I lost two tires on the passenger side. The trailer and truck was not overloaded.

Thank you for the information on the back exterior wall.

19 Keystone Bullet 287QBS
F150 FX4 w/Tow package

Jeff B

Jeff if they aren't overloaded (have you tried a scale yet?) then maybe there was a bad lot of tires or something. That is a phenomenal failure rate to me. I am assuming you have replaced all the tires, if not I would highly recommend doing so and going with one of the more reputable brands; Carlisle, Goodyear etc. Good luck.
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Old 07-28-2021, 09:57 AM   #8
Jeff B Florida
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Sourdough: Already replaced all tires with Carlisle's.
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Old 07-28-2021, 09:57 AM   #9
Jeff B Florida
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Quote:
Originally Posted by JRTJH View Post
The side walls are "vacuum bonded" and feel solid. The rear wall is "hung in place after the trailer sidewalls are installed. If it were also "vacuum bonded" the costs to provide bolt locations to install the rear wall would increase the costs. So, Keystone uses a "partially built wall, the interior luan is glued to the aluminum frame, the wall is then put in position and there is access to the aluminum frame to bolt it to the side walls and the floor, then insulation is installed and the rear "skin" is installed. It's held in place along all 4 perimeters by molding screwed through the FILON. Any windows, ladder mounts, tail lights and if installed, a bar-b-que rack all screw "through the FILON to help secure the rear wall to the frame. When the sun shines on the rear wall, it gets hot, expands enough to make it "bubble, droop or bulge enough to make it appear "loose".

Here are a couple of photos of the rear wall being installed on a Cougar at the factory. In the first photo you can see how the "rear wall without FILON is installed, then as the trailer moves down the line, the FILON is hung in place and trimmed to fit the roofline.
Thank you for the information. Stay well and enjoy.
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Old 07-28-2021, 01:10 PM   #10
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Quote:
Originally Posted by Jeff B Florida View Post
Sourdough: Already replaced all tires with Carlisle's.
While you are under look to see if the laun boards are moldy in the tire areas.
That is not needed if you have the hyper deck floor.
Your 2019 may or may not have the newer floor.
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