The 2010 Dodge Ram Heavy Duty lineup continues its trend toward greater comfort and improved towing prowess -- punctuated by an expressive, big-rig design. Hoping to build upon the momentum generated by its well-received light-duty Ram late last year, Dodge has added a crew cab option to the HD lineup for the first time, and boasts of improved overall capability and interior upgrades. The HD models will be available in the fall.