What Is the Biggest SUV by Exterior Size
The largest production SUV by exterior length is the 2025 GMC Hummer EV SUV, which measures approximately 216.4 inches long and 81.3 inches wide, with a curb weight starting near 4,500 pounds. The Hummer EV SUV competes with the 2025 Chevrolet Suburban, which reaches about 225.7 inches in length, making it one of the longest three-row SUVs sold in the United States. Both models prioritize maximum interior volume and full-size truck platforms, and more details on dimensions and configurations are available on the official GMC vehicle page GMC Hummer EV SUV official page.
For buyers focused on cargo space, the 2025 GMC Hummer EV SUV offers up to 1,300 cubic feet of cargo volume with the rear seats folded, while the Suburban provides over 144 cubic feet of cargo space behind the third row. These figures place them at the top of the segment for families and fleet buyers who need maximum hauling capability without leaving the SUV classification.
Which SUV Has the Most Seating and Interior Room
Seating Capacity and Passenger Space
Several full-size SUVs offer seating for eight passengers in three rows, including the 2025 Chevrolet Suburban, GMC Yukon XL, and Toyota Land Cruiser 300 Series. The Suburban and Yukon XL provide over 144 inches of second-row legroom, while the Land Cruiser focuses on rear-seat comfort and standard hybrid powertrains for global markets. Interior volume comparisons and seating configurations are updated regularly by manufacturers and industry reviewers.
Luxury brands also compete in this space, with the 2025 Mercedes-Benz GLS 600 offering standard five-seat configurations and optional six-seat layouts with rear lounge seating, while the 2025 Lincoln Navigator provides up to 122.1 cubic feet of passenger volume. These models target buyers who prioritize ride quality, noise insulation, and premium materials alongside maximum seating capacity.
How the Biggest SUVs Compare in Powertrain and Efficiency
Engine Options and Towing Capacity
The 2025 GMC Hummer EV SUV uses a dual-motor electric powertrain producing over 1,000 horsepower and up to 11,500 pounds of towing capacity, while the 2025 Chevrolet Suburban offers a 6.2-liter V8 with up to 8,100 pounds of towing. The Toyota Land Cruiser 300 Series uses a 3.4-liter twin-turbo V6 producing 409 horsepower and towing up to 6,500 pounds, with available hybrid systems in select markets.
Efficiency varies significantly, with the Hummer EV SUV rated at approximately 47 MPGe combined by the U.S. EPA, while traditional V8 SUVs typically achieve 15 to 20 miles per gallon in combined driving. Buyers can compare current EPA ratings and official specifications on the U.S. Department of Energy's vehicle comparison tools fueleconomy.gov vehicle search and manufacturer websites for the latest 2025 model data.
Pricing and Market Position
The 2025 GMC Hummer EV SUV starts at roughly $105,000 before destination fees, placing it in the premium electric SUV segment, while the Chevrolet Suburban starts around $60,000 and the Toyota Land Cruiser 300