2026 GMC Sierra 1500 Cab & Bed Configurations

With a reputation for capability and premium interiors, the 2026 GMC Sierra 1500 is ready for any jobsite near Biloxi and weekend adventure with the family out past the Saucier area. The 2026 GMC Sierra 1500 is available in eight trim levels, three cab sizes, and three bed lengths, ensuring a combination for nearly every need. Cab sizes include Regular Cab, Double Cab, and Crew Cab, while bed lengths include Short Bed, Standard Bed, and Long Bed. Learn more about the 2026 GMC Sierra 1500 cab and bed configurations in this guide from the team at Mandal Buick GMC!

2026 GMC Sierra 1500 Cab Sizes & Dimensions

The GMC Sierra 1500 single cab, officially known as the GMC Sierra 1500 Regular Cab, seats three passengers in one row. Meanwhile, the GMC Sierra 1500 Double Cab and GMC Sierra 1500 Crew Cab offer seating for five to six passengers in two rows, depending on trim level and options selected. Explore the interior dimensions of each cab option below to see how much space is available on your drives around Ocean Springs below:

GMC Sierra 1500 Regular Cab, Standard Bed or Long Bed

Trims: PRO (2WD/AWD)

• Seating Capacity: 3 passengers
• Headroom (front): 43.11 inches
• Shoulder Room (front): 66.02 inches
• Hip Room (front): 60.90 inches 
• Leg Room (front): 44.53 inches

GMC Sierra 1500 Double Cab, Standard Bed

Trims: PRO (2WD/AWD), SLE (2WD/AWD), ELEVATION (2WD/AWD)

• Seating Capacity: 5–6 passengers
• Headroom (front/rear): 43.03 inches / 39.88 inches
• Shoulder Room (front/rear): 66.02 inches / 64.88 inches
• Hip Room (front/rear): 61.18 inches / 60.24 inches
• Legroom (front/rear): 44.53 inches / 35.24 inches

GMC Sierra 1500 Crew Cab, Short Bed

Trims: PRO (2WD/AWD), SLE (2WD/AWD), ELEVATION (2WD/AWD), SLT (2WD/AWD), AT4 (4WD only), AT4X (4WD only), DENALI (2WD/AWD), DENALI ULTIMATE (4WD only)

• Seating capacity: 5–6 passengers
• Headroom (front/rear): 43.03 inches / 40.12 inches
• Shoulder room (front/rear): 66.02 inches / 65.16 inches
• Hip room (front/rear): 61.18 inches / 60.24 inches
• Legroom (front/rear): 44.53 inches / 43.40 inches

GMC Sierra 1500 Crew Cab, Standard Bed

Trims: PRO (2WD/AWD), SLE (2WD/AWD), ELEVATION (2WD/AWD), SLT (2WD/AWD), AT4 (4WD only), DENALI (2WD/AWD)

• Seating capacity: 5–6 passengers
• Headroom (front/rear): 43.03 inches / 40.12 inches
• Shoulder room (front/rear): 64.54 inches / 64.00 inches
• Hip room (front/rear): 60.78 inches / 59.24 inches
• Legroom (front/rear): 44.53 inches / 43.40 inches

GMC Sierra Exterior Dimensions

In addition to the three cab sizes, the 2025 GMC Sierra 1500 is available with three bed lengths. Though not every cab size is available with every bed length, GMC offers the most popular combination demanded by Gulfport-area truck owners. Explore the exterior dimensions of each 2026 GMC Sierra 1500 cab and bed combination, as well as the dimensions of each bed length, below:

GMC Sierra 1500 Regular Cab, Standard Bed

Trims: PRO (2WD/AWD)

• Wheelbase: 126.49 inches
• Length, Overall: 210.97 inches
• Width, Max w/o mirrors: 81.15 inches
• Height, Overall: 75.70 inches
• Ground Clearance: 7.88 inches
• Cargo Box Length @ Floor: 79.44 inches
• Cargo Box Width @ Floor: 71.40 inches
• Cargo Box Width @ Wheelhousings: 50.62 inches
• Cargo Box (Area) Height: 22.40 inches

GMC Sierra 1500 Regular Cab, Long Bed

Trims: PRO (2WD/AWD)

• Wheelbase: 139.56 inches
• Length, Overall: 229.73 inches
• Width, Max w/o mirrors: 81.15 inches
• Height, Overall: 75.60 inches
• Ground Clearance: 7.90 inches
• Cargo Box Length @ Floor: 98.20 inches
• Cargo Box Width @ Floor: 71.40 inches
• Cargo Box Width @ Wheelhousings: 50.62 inches
• Cargo Box (Area) Height: 22.40 inches

GMC Sierra 1500 Double Cab, Standard Bed

Trims: PRO (2WD/AWD), SLE (2WD/AWD), ELEVATION (2WD/AWD)

• Wheelbase: 147.44 inches
• Length, Overall: 231.94 inches
• Width, Max w/o mirrors: 81.24 inches
• Height, Overall: 75.60 inches
• Ground Clearance: 7.87 inches
• Cargo Box Length @ Floor: 79.44 inches
• Cargo Box Width @ Floor: 71.40 inches
• Cargo Box Width @ Wheelhousings: 50.63 inches
• Cargo Box (Area) Height: 22.40 inches

GMC Sierra 1500 Crew Cab, Short Bed

Trims: PRO (2WD/AWD), SLE (2WD/AWD), ELEVATION (2WD/AWD), SLT (2WD/AWD), AT4 (4WD only), AT4X (4WD only), DENALI (2WD/AWD), DENALI ULTIMATE (4WD only)

• Wheelbase: 147.44 inches
• Length, Overall: 231.92 inches
• Width, Max w/o mirrors: 81.24 inches
• Height, Overall: 75.49 inches
• Ground Clearance: 7.89 inches
• Cargo Box Length @ Floor: 69.92 inches
• Cargo Box Width @ Floor: 71.40 inches
• Cargo Box Width @ Wheelhousings: 50.63 inches
• Cargo Box (Area) Height: 22.40 inches

GMC Sierra 1500 Crew Cab, Standard Bed

Trims: PRO (2WD/AWD), SLE (2WD/AWD), ELEVATION (2WD/AWD), SLT (2WD/AWD), AT4 (4WD only), DENALI (2WD/AWD)

• Wheelbase: 157.04 inches
• Length, Overall: 242.45 inches
• Width, Max w/o mirrors: 81.24 inches
• Height, Overall: 78.24 inches
• Ground Clearance: 10.97 inches
• Cargo Box Length @ Floor: 79.44 inches
• Cargo Box Width @ Floor: 71.40 inches
• Cargo Box Width @ Wheelhousings: 50.63 inches
• Cargo Box (Area) Height: 22.40 inches

Explore The 2026 GMC Sierra 1500 At Mandal Buick GMC

Now that you know more about the 2026 GMC Sierra 1500 cab and bed options, it’s time to experience this remarkable pickup in person. Contact us today to schedule your test drive in a new GMC Sierra 1500 at Mandal Buick GMC! Our team will review the features and benefits of each trim level and configuration to find the ideal truck for your needs and lifestyle. Save time by getting pre-approved for financing and valuing your trade-in online before visiting us in Diberville!