Why the Mercedes-Benz SUV Biggest Model Rules

Photo Source/Copyright: Mercedes-Benz USA

Six SUVs wear the three-pointed star, but shoppers almost always land on the same practical question: which one actually gives everyone room to stretch out? Sort the lineup from biggest to smallest, and the GLS sits alone at the top, measuring 205.0 inches end-to-end with a 123.4-inch wheelbase. That wheelbase is the specific number worth circling on the spec sheet. It creates genuine, usable legroom inside the cabin rather than just extending body overhangs off either bumper.

Key Dimensions and Footprint

Length gets quoted most often in brochures, but wheelbase does the heavy lifting for interior comfort. Stretching the distance between axles creates real adult-sized space across all three rows.

• Overall length: 205.0 inches
• Wheelbase: 123.4 inches
• Overall height: 71.8 inches
• Overall width: 79.9 inches (84.9 inches with mirrors)
• Curb weight: 5,523 pounds
• Passenger capacity: 7 standard, 6 optional

Pay close attention to that width figure. While the body measures 79.9 inches across, accounting for side mirrors pushes it to 84.9 inches; a detail worth knowing before committing to a narrow garage stall.

Seating Configuration and Middle-Row Options

Every GLS comes standard with three full rows. Seven seats is the default layout, but you can swap the second-row power bench for twin captain’s chairs with a center aisle at no extra cost. That aisle exists by deliberate design. Mercedes-Benz designed row three expecting adults to walk back naturally, rather than clambering over a folded backrest. 

Row two powers, reclines, and slides. Front legroom measures 40.3 inches, row two gets 41.9 inches, and row three offers 34.6 inches. Four-zone climate control comes standard, with V-8 versions adding a fifth dedicated zone for row three.

Cargo Space and Capability

Behind the third row, the GLS holds 17.4 cubic feet of cargo. While rival spec charts might post higher numbers, those competitors often squeeze row three into cramped proportions just to pad cargo figures. The GLS prioritizes passenger comfort.

• Cargo behind row three: 17.4 cubic feet
• Maximum cargo capacity: 84.7 cubic feet
• Third-row mechanism: Power-folding 50/50 split
• Towing capacity: 7,700 pounds
• Fuel capacity: 23.8 gallons

Pressing the cargo button drops both rear rows completely flat to reveal 84.7 cubic feet. Standard AIRMATIC® air suspension manages load leveling, while the factory trailer hitch enables towing up to 7,700 pounds, plenty for a boat or camper.

Powertrains and Performance

Mercedes offers three distinct powertrains across the lineup, each mated to a 9G-TRONIC nine-speed automatic transmission and 4MATIC® all-wheel drive.

*Starting MSRPs exclude destination fees.

The base inline-six moves this 5,523-pound SUV to 60 miles per hour (MPH) in 5.8 seconds. Stepping up to the twin-turbo V-8 drops that sprint to 4.7 seconds, while the AMG® variant hits 60 MPH in 4.1 seconds. Wheels range from standard 21-inch rims to AMG® 22s, with 23-inch designs on the option list.

Cabin Technology and Software

Inside, the cabin runs on MB.OS, featuring MBUX Virtual Assistant, Google Maps navigation, and augmented-reality video overlays for live directions. Three 12.3-inch displays span the dash, while row two offers optional dual 11.6-inch HD screens. A 10.8-square-foot panoramic sunroof comes standard overhead.

Experience the Largest Mercedes SUV

Seeing 205 inches of full-size luxury in person makes all the difference. Stop by our showroom today to browse inventory or schedule a test drive.