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Old 10-31-2021, 10:45 AM   #1
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Name: Gary
Trailer: Trillium
British Columbia
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Pontoon Drain Holes

Hi All,
Looking at purchasing a 1975 Trillium and noticed a 1/2” drill hole on the underside of the trailer shell, beside the door, drilled into the “pontoon”. It looks to me like it drains any water that collects inside the trailer from leaks, spills or condensation.
I saw online on one of “Slim Potatoehead”’s YouTubes, that he actually drilled a 1/2” hole in each pontoon section, (4 in total), then covered them with steel screen to keep wasps out.
Was wondering if anyone else had drilled in drain holes, or had any comments on this topic.
Thanks
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Old 10-31-2021, 12:47 PM   #2
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Name: bill
Trailer: 2013 Escape 19; 1977 Trillium 1300
The Mountains of North Carolina
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Hopefully Slim did not drill a 1/2 hole, as mice can easily pass through that size. Myself, I don't go over about 3/16. But yes, each pontoon section needs a drain hole. If the pontoons fill with water, it will reach the plywood in the floor and then rot begins.
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Old 11-01-2021, 09:38 AM   #3
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Name: Curt
Trailer: '78 Trillium 4500
Alberta
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My drain holes...

The holes I drilled are also about 3/16", but I didn't put in any mesh. If you are putting a mesh there, make sure that it's metal!

Also, there are 4 holes required, one fore and aft of each wheel well.
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Old 11-01-2021, 12:24 PM   #4
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Name: Dave W
Trailer: Trillium 4500 - 1976, 1978 (2), 1300 - 1977, 1973, and a 1972
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If they didn't have holes to begin with, I drilled them. Some had so much water in the pontoons that they drained for quite some time. I don't know why Trillium didn't do this at the factory.
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Old 11-07-2021, 05:50 PM   #5
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Name: Gary
Trailer: Trillium
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Thanks everyone for your suggestions. I plan to drill in 4 - 3/6” holes to drain any existing accumulated water and keep them clear for any future water ingress. Cheers
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Old 11-08-2021, 10:10 AM   #6
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Name: Dave W
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3/6"? Do you mean ½"?
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Old 11-08-2021, 10:45 AM   #7
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Name: Gary
Trailer: Trillium
British Columbia
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Oops,typo.
I meant 3/16”. I have heard 1/2” for better drainage, but you have to attached screen over holes to stops critters from entering, I went with smaller holes (3/16”) and no screen
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