Flat bunk board wood species?

family affair

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One of my pine bunk boards on my 3-year-old trailer completely rotted out. In my area I cannot source Cypress as a material. However I can get cedar. Is there any reason not to use cedar as a bunk board? The consensus is it is slightly more rot resistant than Cyprus.
 
Here on the east coast, pressure treated lumber (pine) is the norm
 
I'm not too concerned about galvanized parts, but I am worried the aluminum and zink parts will get corroded quickly.
I have installed a PT board with the intent of replacing it. Looks like Douglas fir might be the best option locally.
 
No issues on my trailer from PT lumber.
You could use non pressure treated framing lumber but it may not last very long. Lots of variables.

I think you are correct that the PT wood is Douglas fir.
 
No issues on my trailer from PT lumber.
You could use non pressure treated framing lumber but it may not last very long. Lots of variables.

I think you are correct that the PT wood is Douglas fir.
My statement wasn't clear. I used a PT pine board for now.
My intent would be to replace it with a non treated Douglas Fir if I'm seeing too much corrosion.
How long have your PT bunks been on the trailer? Is it in contact with any aluminum parts?
 
Bunks have been on about 6 years.Trailer is dunked twice a year, launching and hauling. Trailer lives at the boat club in a salt water / air environment.
The fittings that attach the bunks to the trailer are galvanized and aluminum( bunk saddles) . Trailer is aluminum
 
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If that's the case, I'll let it go for a while. Mine gets dunked 20-30x in freshwater a season and is stored indoors with low humidity.
Thank you!