2014 Leisure Travel Vans Unity MB Trade-In coming soon to our lot! Pictures to be posted upon arrival! Powered by Mercedes-Benz An impressive feat of German Engineering, the Mercedes-Benz 3500 Sprinter Chassis is the perfect fit for the 2014 Unity by Leisure Travel Vans. And, with a 3 liter V6 BlueTEC diesel engine under the hood, you'll enjoy a smooth yet powerful ride with class leading fuel economy estimated at 18 - 22 miles per gallon.