The specs for the 2006 Dodge Ram Mega Cab Dually are impressive. This model comes standard with heavy-duty engine cooling, an auxiliary transmission cooler, and side mirrors designed for towing large loads. With a payload capacity of 3,240 pounds, a gross combined vehicle weight rating of 23,000 pounds, and a maximum trailer weight of 15,600 pounds, it’s no wonder the Dodge Ram Mega Cab Dually is at the top of its class.