I have a 2x6 floor on my utility trailer. They're 16 years old now and in excellent shape. I originally painted them on all sides with a top quality deck paint. The paint's long gone from the top surface but the wood is still in very good shape. It could easily go another 16 years. I might repaint it to add some years.

“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell

It's not over when you lose. It's over when you quit.