There seems to be production variances across FCA US built vehicles where a few wheels will corrode while most show no signs. Jeep (along with Dodge, RAM, Chrysler) have been replacing them under warranty. My 5 year old WK2 wheels are not showing any signs of corrosion, nor are our 7 year old KK wheels. The Discount tire wheels, however, were badly corroded after just two winters. My WJ went about 6 years.
Seems that GM and Ferd are also having similar issues with wheels. Wonder if they all use the same supplier.
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac