I just installed a storage area in the wasted space above the fridge in my trailer -- if there is a big gap between the top of the fridge and the underside of the shelving in your FF (and if you need more storage), feel free to check out my blog entry, with some pictures and text:
If I recall correctly, someone (I think it was Fred??) recently asked whether this area could be used as storage, and I said no. After further research, I now think I was wrong, and my blog entry explains the situation.
I hope this is helpful!