We use the cab over for storage also. It doubles or inside storage space. We found that several large plastic storage bins with tops that latch work better for us than cabinets or shelves. We don't put really heavy items up there but the bins work well as they can be organized. We have them for extra clothes and coats, boots, and rain gear, kitchen supplies, hiking gear, dry food, etc.
The nice part about bins is you can easily pull them down to get at things and slide them right back up in place when you are done. We have a short curtain that pulls across so we don't see them and a lip keeps them from sliding out on their own.
The cab over can still be used as a bed if we want by putting the cushions back in for a trip.
