I finally got the rocker panel claddings replaced. It took three trips to the dealer (once to verify that they were cracked, the second time to replace them, but the plastic rivets were wrong and had to be re-ordered, and finally today). As a MOPAR part, they are guaranteed for one year. They look like they are constructed better, so I'll keep my fingers crossed.

Just for the record, the claddings cost $60.80 each. Of course, add additional costs for the rivets and labor. You're looking at a $300 job. Anyone who still has the problem, get yourself to your dealer while you are still under warranty.