To Stain, or Not to Stain the Wood on Flatbed Trailer?

[KAF1]

Good day to all, I just finished building most of my Tamiya Flatbed trailer kit and only needs to lay the wood down for the deck. The wood planks for the deck looks do nice that I was wondering if I should stain them to protect them or not. I know that staining the would make them darker, but I don't mind. I just wanted them to be protected from stain like dirt and so forth. Any suggestions or help would be greatly appreciated.
Thanks Ken.