HELP! Extreme inside rear tire wear!

[JonnyBGood]

Guys, I am in need of some advice. The last couple of days, I notice that my driver rear tire is getting low. I filled it up and went home to check for a nail in the tire. Since the rear tires are hard to see, I let it rolle a bit, then check the tire. In doing so, I saw that the insides of my rear tires are wearing to the point that the steel radial belts were sticking out. I touched the inside of the tire and the little steel things were poking into my hand. I checked the other tire, pretty much the same thing!

Its actually a bit scary that I was driving on these tires. Does ANYONE know what might be causing this? The outside of the tire looks fine which is why I never suspected that the inside of the tire is so bad.

Obviously, the tires have to be replaced, but I don't want this to happen again on the next set. Anyone have any ideas? Thanks in advance.

JBG