Glad I checked the mounting bolts today - Page 2 - Fiberglass RV


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Old 04-27-2015, 11:59 AM   #15
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You have a point! 6 bolts doesn't sound like much holding the body onto the frame but if those rusty bolts held on for 40 years, we're probably good with any bolts as a replacement.


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Old 04-27-2015, 12:04 PM   #16
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Just an FYI, on a Trillium 4500, there are 8 bolts. Four bolts in the gaucho, two under each dinette seat.
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Old 04-27-2015, 12:09 PM   #17
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If it was me, I would drill 5/16 out to 3/8. No problem finding 3/8 fasteners!

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Old 04-27-2015, 12:24 PM   #18
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SS is great but maybe a bit of over kill in this circumstance. If mild steel lasted 40 years maybe some new galvanized hardware would do for another 60? I can just hear the conversation in the future: "dang bolts rusted through on my 100 year old FGRV, dadgum that previous owner!"
When I worked in factory maintenance, we had a rule of thumb that if it survived four years, replace it with carbon steel, if not, use stainless.
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Old 04-29-2015, 09:44 PM   #19
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WOW that's scary. So I guess I need to get hubby to check those to since our Bigfoot is a 1984-85. Now I wonder WHERE those bolts would be on ours.
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Old 05-01-2015, 12:50 AM   #20
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I would be hesitant to drill the front bolt holes larger as that is the weak point on the frame where it has broken on so many Trillium's. I suspect your original bolts broke after 40 years of corrosion and new 5/16 will last another 40 years.


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Old 05-01-2015, 03:52 AM   #21
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Something has been bothering me about this and I finally figured out what. My Trillium doesn't have 5/16" bolts, it has 7/16" bolts which is why they were hard to find. The bolts attach to tabs welded to the side of the frame. Raz
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Old 05-01-2015, 04:30 AM   #22
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Raz, being yours is a 2010 model was that bolt size from the builder?
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Old 05-01-2015, 05:43 AM   #23
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Raz, being yours is a 2010 model was that bolt size from the builder?
Yes except the bolts they used were too long. Not enough thread to tighten. They tried to fake it with lots of extra washers but they were still loose. I was checking under my trailer when I spotted them. I had to order the correct size. Raz
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Old 05-02-2015, 08:48 PM   #24
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Got the bolts on today since the weather is finally cooperating. One thing I noticed, the bolts right behind the wheels need to be slightly longer. Maybe 1/4". I'm using a flat washer and lock washer on the others. Only able to get a flat washer on the middle bolts. No big deal. Just an fyi in case someone else is doing this in a Trillium.


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Old 05-04-2015, 10:29 AM   #25
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Just an FYI, on a Trillium 4500, there are 8 bolts. Four bolts in the gaucho, two under each dinette seat.

David, could you do one of your wonderful drawings with the location of these bolts. (trillium 4500) I am also confused a bit as people say the floor is fiberglass/plywood/fiberglass yet the floors of my compartments are plywood.

Two of the rear bolts have been replaced but the other two look pretty gone. I can only find two in the dinette area, not four.

Thanks greatly for all you do.
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Old 05-05-2015, 02:56 PM   #26
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I will update my frame drawing to show the bolt locations.
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