WOOD FLOOR IN THE BACK UNDER THE BED AREA

Personally, I don't care much for a hard floor anywhere that is going to be storage, because all the stuff slides around too much. Our underbed storage has been redone with nice rubber backed entrance mat material (thin) that is just enough carpet to keep stuff in place and quiet.

If you are replacing the flooring why wouldn't you just cut it to the sizes of the lift up door. That is very handy for storage and the reason for the hinge is so it can be lifted with the bed in place. I think you are talking about a Roadtrek. It does help when you give adequate info. We don't know what you are referring to without some info.

I put in some "Allure" flooring. Looks like a laminate but it's a vinyl. It's more stable than wood. Lay it tight, no space around the edge.