In 2015, Heavy Duty Trucking Magazine made an effort to increase video content so online readers could have high-quality, hands-on looks at some of the year’s most important equipment and technologies.

With the Ultimate Test Drive video series, featuring tests of 2015's newest trucks, and our Focus On... series, HDT produced original videos made for the people who live and breathe trucking.

Here is a list of the 5 most popular videos of the year:

Ultimate Test Drive Video Small Block Big Load

In this video, we test Mack's 13-liter MP8 engine. It may be small in stature, but it's big on performance. It delivers 505 horsepower and 1,860 lb-ft of torque, which is more than enough to pull 138,000 lbs through the mountains on B.C.'s Vancouver Island.  

Ultimate Test Drive Video: 5700XE Desert Road Test

Equipment Editor Jim Park takes the new Western Star 5700XE to the Nevada desert to put the truck through its paces on tough roads and steep grades.  

A Closer Look at the Walmart Concept Truck

The Walmart Advanced Experience concept truck may be futuristic-looking but by using many of the latest efficient technologies, it gives us a glimpse of what could be possible today.

Focus On ... Peterbilt Autonomous Technology

Peterbilt showed off its take on autonomous vehicle technologies to reporters at the Texas Motor Speedway. The "advanced driver assist systems" are the "cruise control of the future" and a "stepping stone to autonomous vehicles."

Focus On… In the Cab of Freightliner's Autonomous Truck

In this "Focus On" video, HDT Equipment Editor Jim Park gets a front-seat feel of Daimler Trucks North America's concept Inspiration Truck and the Highway Pilot autonomous control system in action.