Here are pictures of spark plug at 31,000 miles
Got the 30,000 mile tune up done today. Truck actaully has 31,000 miles. All 16 spark plugs replaced. Here are some pictures of their condition. Note: I do not do any towing and my driving habbits are moderate...meaning I'm in the throttle quite heavy at times but not really alot.
Looks like dodge at least put in some decent NGK-R plugs though.