With the short-lived R-Class, Mercedes tried something new. It did not succeed. Part station wagon, part minivan, and part SUV, the R-Class was a three-row, seven-seat oddity sold between 2006 and 2012. It offered a choice between a gas or turbo-diesel V6 and gas V8 engines. Briefly, you could even get an AMG-tuned performance version called the R63 AMG. If a collectible R-Class exists, that's it. By 2009, Mercedes had dropped the rear-drive versions of the R-Class, making all-wheel drive standard. A refresh in 2011 updated the model's styling, and a new V6 engine arrived in 2012. However, that would be the R-Class's final year on sale in the U.S. Mercedes did not replace it, leaving the brand's SUV and wagon lineup to satisfy customers seeking this type of vehicle.