2026 GMC Sierra 1500 Cab & Bed Configurations

With a hard-earned reputation for rugged capability and premium interiors, the 2026 GMC Sierra 1500 is ready for any heavy-duty jobsite near Manchester and weekend adventure with the family out past the regional Merrimack area. The new GMC Sierra 1500 is available in eight distinct trim levels, three cab sizes, and three box lengths, ensuring a custom performance combination for nearly every light-duty truck owner. Cab sizes include the streamlined Regular Cab, practical Double Cab, and family-sized Crew Cab, while bed lengths include the Short Bed, Standard Bed, and Long Bed. Learn more about the 2026 GMC Sierra 1500 cab and bed configurations in this comprehensive guide from the truck experts at Tulley Buick GMC!

2026 GMC Sierra 1500 Cab Sizes & Interior Dimensions

The GMC Sierra 1500 single cab configuration, officially known as the GMC Sierra 1500 Regular Cab, comfortably seats three passengers in a single row. Meanwhile, the spacious GMC Sierra 1500 Double Cab and high-end GMC Sierra 1500 Crew Cab models offer expansive seating for five to six passengers across two rows, depending on the specific trim level and seat options selected. Explore the precise interior dimensions of each cab option below to see how much space is available for your crew on daily drives around Concord:

GMC Sierra 1500 Regular Cab (Standard Bed or Long Bed)

• Available 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
• Legroom (Front): 44.53 inches

GMC Sierra 1500 Double Cab (Standard Bed)

• Available 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)

• Available 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)

• Available 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

2026 GMC Sierra 1500 Exterior & Truck Bed Dimensions

In addition to the three cab sizes, the 2026 GMC Sierra 1500 line features three functional bed lengths designed to maximize hauling safety. Though not every cab configuration is matched with every bed length, GMC offers the most popular, high-utility layouts demanded by vehicle owners across the greater Rochester area. Explore the exterior dimensions of each 2026 GMC Sierra 1500 cab and truck bed combination below, alongside cargo volume stats:

Regular Cab, Standard Bed

• Wheelbase / Overall Length: 126.49 inches / 210.97 inches
• Width (Max without mirrors): 81.15 inches
• Ground Clearance: 7.88 inches
• Cargo Box Length / Width @ Floor: 79.44 inches / 71.40 inches
• Cargo Box Width @ Wheelhousings / Area Height: 50.62 inches / 22.40 inches
• Total Cargo Bed Volume: 71.70 cubic feet

Regular Cab, Long Bed

• Wheelbase / Overall Length: 139.56 inches / 229.73 inches
• Width (Max without mirrors): 81.15 inches
• Ground Clearance: 7.90 inches
• Cargo Box Length / Width @ Floor: 98.20 inches / 71.40 inches
• Cargo Box Width @ Wheelhousings / Area Height: 50.62 inches / 22.40 inches
• Total Cargo Bed Volume: 89.10 cubic feet

Double Cab, Standard Bed

• Wheelbase / Overall Length: 147.44 inches / 231.94 inches
• Width (Max without mirrors): 81.24 inches
• Ground Clearance: 7.87 inches
• Cargo Box Length / Width @ Floor: 79.44 inches / 71.40 inches
• Cargo Box Width @ Wheelhousings / Area Height: 50.63 inches / 22.40 inches
• Total Cargo Bed Volume: 71.70 cubic feet

Crew Cab, Short Bed

• Wheelbase / Overall Length: 147.44 inches / 231.92 inches
• Width (Max without mirrors): 81.24 inches
• Ground Clearance: 7.89 inches

• Cargo Box Length / Width @ Floor: 69.92 inches / 71.40 inches
• Cargo Box Width @ Wheelhousings / Area Height: 50.63 inches / 22.40 inches
• Total Cargo Bed Volume: 62.90 cubic feet

Crew Cab, Standard Bed

• Wheelbase / Overall Length: 157.04 inches / 242.45 inches
• Width (Max without mirrors): 81.24 inches
• Ground Clearance (High-Clearance Setup): 10.97 inches
• Cargo Box Length / Width @ Floor: 79.44 inches / 71.40 inches
• Cargo Box Width @ Wheelhousings / Area Height: 50.63 inches / 22.40 inches
• Total Cargo Bed Volume: 71.70 cubic feet

Explore the 2026 GMC Sierra 1500 at Tulley Buick GMC in Nashua, NH

Now that you are familiar with the versatile 2026 GMC Sierra 1500 cab and bed options, it’s time to experience this remarkable premium light-duty pickup truck in person. Our dedicated sales team will happily review the custom features, maximum towing capacities, and tailored comfort benefits of each available trim to secure the ideal model for your lifestyle. To accelerate your buying experience before visiting our showroom, you can securely apply for financing online or find the accurate market value of your trade-in vehicle using our digital value your trade tool. Contact us today or visit Tulley Buick GMC in Nashua to test drive the hard-working 2026 GMC Sierra 1500 and drive home with confidence!