After unveiling it as a concept just one year ago, Mercedes has officially taken the wrapper off the X-Class pickup. The full-size quad-cab will be offered in both 2WD & 4WD with several engine options including a pair of 4-cylinder diesels, a 4-cylinder gas, and a V6 diesel. G-Class level luxury is all there but so is the utility: cargo capacity is 1.1 tons.