Have you ever seen panniers with wheels? You know how a lot of luggage these days have wheels and pull handles so that people can roll their suitcases through airports, train stations, and hotels more easily ... that's the sort of wheels I'm talking about.
The biggest challenge I find with panniers is when they are not on the bicycle. When they are on the bicycle, they can be moved around reasonably easily, but take them off the bicycle in order to carry them to your room in a hotel, and they are awkward and heavy.
So ... do you know of any companies that sell panniers with wheels?
Or as an alternative to that, are there small, light, foldable "trollies" onto which one could place panniers (or suitcases) to transport them around?