In part one, the guys built a 2003 4Runner to clear 40-inch tires, and this time they head to the dirt to try it out. The Dirt Heads invite a few friends to bring their 4Runners along for the adventure as they tackle Fordyce, a challenging trail in Northern California.

Everyone knows that if you want to put 40-inch tires on a Toyota, you need to cut out the independent front suspension and put in a solid axle. But Fred Williams and Dave Chappelle have other plans. They want to see just what it takes to stuff massive tires on an IFS truck.

Fred Williams and Dave Chappelle find themselves in Idaho with no way home, and they have a set of 37-inch Mickey Thompson tires. The plan is simple: find a truck, make it run, make the 37s fit, and drive home. Oh, and remember they have to hit Dirt Every Day. What do you think they'll find?

What does it take to be the perfect sand dune machine? The Dirt Heads have attempted to build sand machines before, but had less-than-stellar results. This time, it will be different. The guys start with a V8-powered Nissan Armada and go about removing (almost) a ton of weight to make it climb big dunes with ease.

Fred Williams and Dave Chappelle start in Bend and attempt to ride two Honda three-wheelers all the way to the Oregon coast. They were warned they would crash. They were warned they would die. They were called idiots. Only two turned out to be true.

Fred has been stalling on getting his red Ford GPW Flatfender Jeep finished and on the trail, and now it's down to crunch time. In order to make it to the big Moab Easter Jeep Safari, Fred gets Dave into the shop for some old-school knuckle bustin'.

Fred Williams surprises Dave with something he wasn't expecting. To combine both Dave and Fred's favorite things, Fred picked a strange cab-over-style Isuzu and the guys turn it into an off-road machine in under a week.