76 trillium rock guard -- poor design - Fiberglass RV


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Old 08-21-2021, 10:04 AM   #1
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Name: Bernie
Trailer: 1976 Trillium 1300
Illinois
Posts: 13
76 trillium rock guard -- poor design

I am pretty sure the rock guard (RG) is original. It is intended to be mounted on a flat surface. Unfortunately, where the RG hinges are attached to fiberglass just above the front window, is not flat. The fiberglass the front window attaches to is flat, however, directly above the window, where the RG attaches, the surface of the fiberglass begins to round off quickly. This results in the RG hinge being attached to a surface that is not in the same plane as the RG. The plane the RG hinge is attached to is about 10 off vertical. When hanging down in its relaxed position it is several inches from being closed. The RG hinge is one of those cylinder inside of a cylinder things and is not very forgiving when it comes to rotating past either of its range limits. So, when I try to force the RG closed a lot torque is applied to the hinge/fiberglass joint. This just isn't right.

I have looked through most of the RG threads on here and have not seem mention of this. Has anyone else came across this?
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Old 08-21-2021, 11:28 AM   #2
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Name: bill
Trailer: 2013 Escape 19; 1977 Trillium 1300
The Mountains of North Carolina
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Nope. The original Trillium rock guard used the window plywood for attachment. So the rock guard frame has to be very close to the window frame (or it will be beyond the plywood and not be able to be screwed into place. Sounds to me like someone reattached the rock guard, and went too high with it.

I'm guessing with no pictures.
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Old 08-21-2021, 03:41 PM   #3
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Name: Bernie
Trailer: 1976 Trillium 1300
Illinois
Posts: 13
My rock guard sits directly on top of the window and screws into the same piece of plywood that the window screws into. As you can see from the attached photo the mounting surface for the rock guard has a slight curvature and is not in the exact plane of the window.
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Old 08-21-2021, 03:46 PM   #4
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Name: Bernie
Trailer: 1976 Trillium 1300
Illinois
Posts: 13
I think I have discovered the problem. My front window is mounted a couple inches higher than my rear window. See pics.
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F9AC9559-1CA0-4346-8737-457202F4373D.jpg   71951699-6555-4FC0-9096-F46A8D0EE0A9.jpg  

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Old 08-21-2021, 04:50 PM   #5
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Name: bill
Trailer: 2013 Escape 19; 1977 Trillium 1300
The Mountains of North Carolina
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Your top window flange looks like it is where my top rock guard flange sits. But you can see the bottom window flange basically lines up with the vertical seam on the trailer.

The top rock guard flange is definitely on the curve, you can see the angle between the top flange and side flange on the rock guard, clearly not 90 degree angle there.
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IMG_9878.jpg   IMG_9874.jpg  

IMG_9871.jpg  
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