Light Front, Runs and Drives, Passenger Airbags Good., , More luxury brands are entering the small-crossover segment, including Mercedes-Benz, which expanded its lineup of luxury crossovers for 2010 by adding the five-seat GLK-Class. Offered in GLK350 form with a 3.5-liter V-6 engine and either rear-wheel drive or 4Matic all-wheel drive, it features recognizable Mercedes styling cues as well as available high-tech features.