How Big Is The Big SUV Mercedes-Benz?

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If you’re hunting for a full-size family hauler wearing a three-pointed star, the Mercedes-Benz GLS is where the search usually ends. Excluding the commercial Sprinter van, the GLS reigns supreme as the longest, tallest, and roomiest passenger vehicle in the entire Mercedes-Benz lineup. While the iconic G-Class grabs magazine covers and social media attention, it caps out at five seats and stops there. The GLS, stretching 205.0 inches end-to-end on a generous 123.4-inch wheelbase, actually builds its identity around real family usability.

Third-Row Comfort That Isn’t an Afterthought

Plenty of luxury three-row crossovers claim to carry seven people, but many relegate the rearmost seats to small children or emergency-only trips. The GLS comes standard with seven seats, though you can option second-row captain’s chairs to trade one seat for a dedicated middle pass-through and considerably nicer middle-row real estate. 

The real magic lies in the numbers: 34.6 inches of third-row legroom, roughly five inches more than any other SUV wearing the badge. Paired with 38.9 inches of headroom and 50.3 inches of shoulder room back there, full-grown adults and teenagers can ride without drawing straws for the back row. The second row slides forward and backward, offering 41.9 inches of legroom, so negotiating legroom between rows two and three is an easy, real-time balance.

Cargo Space Built for Real-World Demands

A classic flaw in many luxury three-row SUVs is that using all three seating rows leaves you with a trunk slot barely deep enough for a backpack. The GLS avoids this trap by supplying 17.4 cubic feet of cargo space behind row three, plenty for a week’s worth of groceries, several carry-on bags, or sports gear. 

When you fold rows two and three flat, maximum cargo volume opens to an expansive 84.7 cubic feet with a flat load floor. The electric power-folding third row adds significant daily convenience when you’re standing at the tailgate with full hands. Standing 71.8 inches tall and equipped with a maximum towing capacity of 7,700 pounds, it keeps trailers and boats firmly in your weekend plans.

Three Powertrains, Three Distinct Personalities

Under the hood, Mercedes offers three distinct engine flavors, all routed through a 9G-TRONIC nine-speed automatic transmission, standard 4MATIC® all-wheel drive, and AIRMATIC® air suspension:

• GLS 450 4MATIC®: Powered by a 3.0-liter turbocharged inline-six with EQ Boost mild-hybrid assist, delivering 375 horsepower and 369 pound-feet of torque. It provides smooth, responsive low-end push for daily commuting and represents the smart play for most buyers.
• GLS 580 4MATIC®: Steps up to a muscle-bound 4.0-liter biturbo V-8 churning out 510 horsepower for strong highway cruising.
• Mercedes-AMG® GLS 63: Features a handcrafted 4.0-liter biturbo V-8 pushing 603 horsepower, a gloriously unhinged option for a seven-seater.

Pragmatic Trade-Offs to Keep in Mind

Nothing measuring 205 inches long comes without practical compromises. Fuel economy on the V-8 engines will remind you of their power at fill-ups, though the inline-six mild-hybrid setup softens the blow by smoothing out stop-and-go city traffic. 

Parking is another honest consideration: spanning 79.9 inches wide without mirrors (84.9 inches with them), navigating older downtown garages becomes a deliberate project. Yet, that width exists by design because shoulder room across three full rows has to come from somewhere.

Experience It in Person

Numbers on a page only go so far with a full-size luxury SUV. Sit in the third row, test the power seat controls, and make sure it clears your garage door before taking it home. Contact our team to schedule a test drive, explore GLS inventory, or configure the right setup for your household.