What type of plywood for trailer build?

[IdaSHO]

In the past few years I have come across a few problem sheets of baltic birch.
Like a lot of things, quality and quality control has slipped as far as I can see.

And be careful with "marine grade" plys, many building supply stores carry what is commonly referred to as AB-MARINE ply.
This is typically a fir plywood with water-resistant adhesives.

IMO, it has no business in a custom camper, and is nothing like a legit bs1088 rated ply.

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[djcressman]

Thanks for the input everybody. After some discussions with somebody that has built many trailers and calling a supplier, I bit the bullet and just ordered some okoume marine grade plywood.

I was strongly advised against ACX due to large voids that can trap water, expand, and delaminate the plies.