I have a 2010 FWC Grandby shell. I had the factory install some basic cabinets/closets in each corner, but otherwise kept it open inside. Part of the motivation for this was to be able to carry bikes when I'm towing a trailer. I rigged up a removable bench in the front of the shell out of surplus stair tread and then mounted fork mount carriers for the bikes using bolts and wing nuts. This keeps the bikes stable on backroads. Attached photo shows the bench prior to installing the fork mounts. Mounts are easily removed when I'm not towing the trailer. When camping with the shell, I carry the bikes off the back on a swing away hitch mount bike rack. I mounted the bench high enough to fit large coolers underneath. I've also carried up to 8 5 gallon water containers under the bench.