We recently traded up fro a FC 20' to the FC 23FB. We do not travel with a lot of clothing that needs to be hung up and my better half was suggesting that there needs to be more storage space in the 23'.
I went down to Home Depot and bought ClosetMaid 41 in. H Drawer Kit with 5 Wire Baskets. It fits perfectly into the closet by the microwave. Secures on the rear facing wall, cotter pins prevent shelves from moving back into aluminum wall. All in all it filled the bill quite nicely!