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I used Thompson's waterseal. I applied it in the summer also, I kept rolling it on untill the deck would not soak up anmore. Seams to holding up well after two seasons being stored outside.
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Brush on regular automotive engine oil. It soaks into the wood like you won't believe and lasts quite a while. Best to do this in the summer when you're not using the trailer.
There is a green treat liquid that is for fence posts. It is a preservitive for wood below grade. It prevents or delays rot due to moisture. I cant remember the name. It comes in a rectangular 1 gallon can. Its white with redish orange and black letters.
I own a Painting Co. and a Fencing Co.. This is the product you want. Brush it into the wood well. You probably dont want a oily surface. Do it in a warm place so it absorbs. The wood should not be wet either.
Good luck