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When it comes to consumer loyalty, you'd be hard pressed to find a more dedicated group of fans outside the heavy-duty pickup segment. Recognizing this, Dodge has brought a slew of full-size trucks to the Chicago Auto Show in the form of the 2010 Dodge Ram 3500, 4500 and 5500 HD Chassis Cabs.

Dodge started the heavy-duty retrofit with the highly-competent 1500 model introduced last year, then proceeded to create a crew cab variant that's claimed to be packing the most room in its class. Both regular and Mega Cab variants will be offered, along with two bed sizes (six-foot, four-inch or eight-foot) and five trim levels: ST, SLT, TRX, Laramie and Power Wagon.

Pickup aficionados will notice the new bumper treatment, larger grille (with chrome, black or body-colored trim), wider fenders for the dually models and the subtle tailgate lip to improve aerodynamics.

The HD comes standard with Dodge's HEMI 5.7-liter V8, putting out 383 hp and 400 lb-ft of torque through a beefed-up 545RFE five-speed automatic. However, with a take-rate of over 90% for the diesel engine on HD models, Dodge is offering the optional 6.7-liter Cummins inline-six that channels 350 hp and 650 lb-ft of torque to a 68RFE six-speed automatic featuring low-speed "creeper" mode and Electronic Range Select, allowing the driver to limit which high gear is used while towing. Two 4x4 models will be offered, along with four different axle ratios, and on the topic of towing, the Ram 3500 HD, equipped with the Cummins turbodiesel, dual rear wheels, 4x4 system and a 4.10 rear axle ratio can handle a maximum payload of 5,110 pounds and a towing capacity of 18,500 pounds.