For 2009, International and Mack introduce the two biggest newcomers to the heavy-duty scene – International with its owner-operator-minded LoneStar, and Mack with its severe-service behemoth Titan. And Daimler Trucks North America is ending the Sterling Trucks brand in March as part of a response to continued low truck sales and structural changes in the market. (We continue to list specs for Sterling products because dealers will take orders through Jan. 15 and because Daimler may continue some models under the Freightliner and Western Star brands.)

Meanwhile, the other major players are making their own model modifications and spec adjustments. Here are some highlights:

Freightliner: The truck maker is adding several enhancements to its Cascadia tractor and other models. The Cascadia now is available in a 72-inch XT sleeper model targeting flatbed and tanker operations. Dometic under-bunk refrigerators, also available for the Cascadia, include a slide-out drawer to ease driver access and can serve as both a refrigerator and freezer (based on thermostat setting).

Air disc brakes are available as factory-installed options for the Cascadia, Columbia, Coronado and Century Class S/T. The Bendix ADB22X-V Air Disc Brake, designed for 22.5-inch steel and aluminum wheels, is compatible with all 22.5-inch wheel combinations and approved for all on-highway applications; the disc brakes also are compatible with drum brake-equipped trailers.

Freightliner, in conjunction with Meritor WABCO, announced the availability of the OnGuard Collision Safety System for select Cascadia and Century Class S/T fleets; OnGuard is a forward-looking radar-based adaptive cruise control system with active braking. Also, high-visibility bright-orange seatbelts manufactured by LifeGuard Technologies are a factory-installed option on the Cascadia, Columbia, Century Class S/T and M2.

GM: The Chevrolet Kodiak/GM Topkick now boasts revised air seats and Allison Prognostics on all 3000/3500 Series transmissions. GMC’s T-Series also offers Allison Prognostics on all 3000 Series transmissions.

International: International Truck and Engine touts its new LoneStar tractor as merging the classic styling preferred by chrome lovers with aerodynamic design and technologies sought by fuel-conscious owner-operators. The company says the LoneStar offers improved ergonomics, an industry-leading suspension, advanced electronics and a quiet cab. Automotive-style features include standard ABS, roll stability, traction control, automotive-style dash and gauges with rosewood or titanium trim, and a 50-degree wheel cut.