The 2012 Ram 2500 heavy-duty pickup is available in three cab styles: regular, Crew Cab and Mega Cab (a jumbo crew cab). The regular cabs come with a long bed only, while the Crew Cab has either a short or long cargo bed. The Mega Cab rides on the same wheelbase as the Crew Cab long bed, but it combines an even bigger cabin with a short bed. The regular cab comes in ST or SLT trims; the Crew Cab in ST, SLT, Laramie, Laramie Longhorn and Power Wagon trims; and the Mega Cab in SLT, Laramie and Laramie Longhorn only. The Ram ST trim level that comes with 17-inch steel wheels, black grille/bumpers, vinyl upholstery and flooring, a 40/20/40-split front bench seat, air-conditioning, an electronic vehicle information display, a tilt steering wheel and a six-speaker stereo with a CD player and auxiliary audio jack. Power windows and door locks are standard on Crew Cab models, while regular cabs have manual controls. Opting for the diesel will also get you an exhaust brake. Typically seen only on big rigs, an exhaust brake provides additional stability and braking power when towing very heavy loads. And those loads can be quite substantial. The Ram 2500 has a maximum tow rating of 14,000 pounds with the gasoline engine, 13,400 for the manual-equipped diesel.