I was trying to figure out what kind of storage bins might fit in that outside door that opens to storage under the bed. My solution was to purchase two plastic window planters that I found at Lowes garden dept. They carry ones that are 23in. and 36in. long 7in.H 8in. W. Now I can fill them with those smaller items that would get scattered around the storage space. Two of these fit in the storage space with room for other goodies. And, the planters can slide in and out so I'll be able to easily find what I need.
While you are shopping, pick up an empty 5gal. paint bucket. One of these will fit perfectly next to your propane tank for hoses, electric cord, etc. This is not my original idea. Came to me from skwhee.