The 2010-model Dodge Ram Heavy Duty pickups and Chassis-Cab models are getting bolder, more aerodynamic styling and nicer interiors introduced on the '09 Ram 1500. Larger grilles and taller hoods reflect the HDs' stronger capabilities. Some HD versions have 500 to 600 pounds more payload and towing capacity. Dual-rear-wheel pickups have one-piece bed-side and fender panels instead of separate bed-and-fender pieces. A four-door crew cab has longer rear doors and greater leg room for true six-person capacity.