Are you stronger than a Mack truck? Competitors for the World's Strongest Man competition recently took on the challenge.

Pulling Mack Pinnacle Axle Back model tractor was one of the qualifying events during the 35th annual World's Strongest Man competition, conducted at the Commerce Casino and other locations throughout Los Angeles, Calif.

The World's Strongest Man competition, which aired on ESPN on Dec. 30, pitted men from 17 countries against each other, testing the limits of human strength and endurance through a series of extreme events.

Competitors in the truck pull qualifier wore a harness connected to a rope and had to pull the Pinnacle tractor more than 30 meters (32.8 yards) in the shortest amount of time.

Hafpr Bjrnsson, of Iceland, won the qualifying round for the second year in a row, finishing in 26.93 seconds. Terry Hollands and Zydrunas Savikas finished the competition second and third place, respectively. All advanced to the next phase of the competition.

Some of the other extreme events involved lifting (and sometimes throwing) heavy objects such as giant dumbbells, logs, kegs, and large round stones called Atlas stones.

"The Mack Pinnacle is an intimidating opponent even for the strongest men in the world," said Tracey Craik, fleet sales manager for TEC Equipment in La Mirada, Calif. "When the event organizers approached us for a truck to use in the contest, our first recommendation was the Mack Pinnacle model because of the truck's big power, strength and durability -- all the right elements to test the World's Strongest Man."

The Pinnacle is designed for over-the-road hauling, with a Mack Advantage chassis to optimize payload. It's equipped with the Mack MP8 engine offering 1,760 pounds-feet of torque and 505 horsepower.

"Mack Pinnacles have a lot in common with the men who participate in this competition because they are built to handle maximum payload without stopping or slowing down," said John Walsh, Mack vice president of marketing.