Bed floor, real wood or fake?

[Atommik]

I've been thinking ahead to the time I'll be ready to install the bed floor in my 51. I plan on driving my truck as much as possible, April-October, and I am wondering how well a poly-urethaned oak bed floor holds up and continues to look good. Will It need to be refinished every few years? I will most likely be occasionaly driving in the rain, and it will sit out in the sun while I am at work. Has anyone used the "plastic" decking material as a bed floor? I thought I saw a post with someone doing this...