LAS VEGAS—Mack Trucks introduced a series of enhancements to its Granite conventional straight trucks and the heavy-haul Titan by Mack model on March 24 during CONEXPO-CON/AGG 2011 in Las Vegas.

Mack debuted a medium-heavy duty version of its Granite model, which is geared toward truck operators for who lighter specs can accomplish the job, such as some municipalities.

“In the current economic environment, companies are taking an even harder look at how much truck they truly need,” said Curtis Dorwart, Mack vocational products marketing manager.

The Granite MHD is available in both axle-forward and axle-back configurations, is powered by a Cummins ISL9 EPA 2010-certified engine and is offered with an Eaton manual or Allison automatic transmission.

Mack also announced that both its Granite Axle Forward and Granite Axle Back models can now be ordered with a 36-inch flat-top sleeper equipped with a 30 by 80-inch mattress, curtain, bunk restraint, under bunk storage and cup holder – as well as rear and side window options.

“We’ve seen a considerable increase in the number of vocational customers expanding their operations beyond regional sites,” Dorwart said, adding that the Mack Granite sleeper is ideal for truck operators in any market that are “working to meet the federal hours-of-service requirements.”

Further enhancements to the Mack Granite series include a new headliner console, optional one-piece windshield, and updated Champion Level trim package with button-tuck vinyl and ultraleather seats that delivers the comfort and styling drivers desire at no extra charge over its predecessor.

The new Champion Level trim package and one-piece windshield are also available in the Titan by Mack model. A cab-mounted exhaust option available in all Granite models and a clear back-of-cab assist Mack body builder partners.