One cautionary note on ceramic pads: They have less friction when they are cold, like the first stop in the morning, or even after cruising on the highway in cool weather. They have great stopping power when warm, but I didn't like the excess distance when cold. Probably less of an issue in a motorhome, since they'll heat much quicker. Just be aware your first stop or two each trip will take a little more stomp power.
I would not expect sealed bearings to need replacing so soon, unless they were ever submerged in water.
