Thanks to all. I think I am going the plastic cutting board route.
This FR blog feature certainly is a great asset to get valuable inputs from fellow RVers who have experienced similar issues. I love it.
I built two like this, no paint no stain, plain ol'pine.
Do you park the tires like the boards are in the picture or on the flat side? I would be hesitant to park like they are in the picture and the slots would put additional stress on the tires from being unsupported.