We had a pod on our old Pace Arrow, and it worked pretty well for us, as it stored bulky stuff and things not often needed. Haven't seen too many on big diesels because of the larger available bay storage. As long as it is properly installed and isn't too high, a pod would be a handy solution for you. Another option - Camping World sells hoists now for just the purpose of lifting covers; they attach to the top of the ladder.
-Joel