Most of the pallet wood around here, though Oak is very rough and unusable for anything more than pallets.

A better choice than pressure treated where you want to paint is a naturally non rotting wood such as redwood, cedar or cypress, if you can afford it. A single gate might fit in that category. Be sure to use galvanized or stainless steel fasteners.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.