TBD. Not sure yet. the bed will get mocked into place soon and then we can put all the stuff we need in place to see what we can do. We also wanted to flush in a beer cooler in the bed also! The back frame behind the axle those mounts are for the tank and the two compressors. then above that we will mount the cooler, and the fuel tank will be behind the cab, flush into the bed floor. More than likely it will be a raised sheetmetal floor, a few inches below the bed rails. Then maybe put a snap on cover, so when you unsnap it its a LOL when there isnt more and an inch of storage under it! haha