I have lost count of the MH owners that have come in for their annual oil change, and not want to do anything else, not even check the tire pressure! After I show them that the tires are half flat, I then offer to pull off a dust cap on one of the wheels. 9 times out of ten, the grease that is visible inside the hub (if any at all) is dried up and cracked, and there is rust on the inside of the cap, if not a few drops of real water. And still a lot of them opt not to take care of an obvious problem they can see with their own eyes. Truly incredible.