The United States is home to dozens of amazing national parks, and Rob and Jan Wilson are determined to see as many as they can in a single road trip. To do it, they'll drive an Airstream Mercedes-Benz Sprinter Interstate 3500 20,000 miles on a tour of the country and 50 of our greatest national parks.

Their chariot began life as a Class-B 2010 Mercedes-Benz Sprinter Interstate 3500 with a 154-horsepower 3.0-liter turbo diesel V-6 good for 280 pound-feet of torque. Before they caught the keys, though, famed RV builder Airstream had their way with it. The result is a rig fitted with seating for eight, a table for four and a bedroom for two along with a 19-inch flat-panel LCD TV, a microwave oven, two-burner stove, energy-efficient mini-fridge, auxiliary AC unit, 2.5-watt propane generator and a 32-gallon fresh water tank feeding a water heater, sink, toilet and shower. For their eight month trip, the Wilson's RV is decked out with even more amenities including GPS, satellite TV and radio and a special laptop with mobile wireless internet so they can blog, tweet and share videos about their trip on their website, www.sprintertour.com.

After leaving Colorado two weeks ago, the couple headed south into New Mexico and Arizona. Their trip will take them up the Pacific Coast and all the way into Alaska before swinging back into the Northwest. Traveling along the top of the country, they'll trek all the way up into Maine before dropping down into Florida. Ultimately, they'll end up at the Recreation Vehicle Industry Association's National RV Show in Louisville, Kentucky, on November 30.

Source: Mercedes-Benz