The answer may be surprisingly simple: it may well be the best version of the Mercedes-Benz R-Class presently available to Americans. Though the $1500 cheaper R350, with its gasoline-powered V-6, may appeal to those on a budget, the power, refinement, and efficiency of the R320 make it the more compelling option for most customers.
Despite the conventional rear doors, the 2009 Mercedes R320's three rows of seating, tall ceiling, and acres of cargo room (provided at least one row of seats is folded) certainly give it the functionality of a minivan.