2025 GMC Sierra 3500HD Truck Body Options

The 2025 GMC Sierra 3500HD is the full-size heavy-duty work truck platform that forms the backbone of many Texas and Louisiana commercial fleets. Available in both SRW and DRW configurations, with available Duramax diesel, the Sierra 3500HD handles flatbeds, service bodies, crane bodies, and landscape bodies with authority. Star Truck Equipment in Wharton, TX is one of the Gulf Coast’s leading upfitters for Sierra 3500HD trucks — here’s the complete buyer’s guide for truck body fitment.

Sierra 3500HD Cab-to-Axle (CA) Measurements

CA length drives body selection. On the 2025 GMC Sierra 3500HD:

Regular Cab DRW: 56″ CA or 84″ CA
Double Cab SRW: 60″ CA or 84″ CA
Crew Cab SRW/DRW: 60″ CA

For full-size 9′ service bodies and 9’4″ flatbeds, the 84″ CA configuration is standard. The 60″ CA Crew Cab accommodates up to 9′ service bodies on some body manufacturers’ specs — confirm before ordering. The DRW Regular Cab with 84″ CA is the classic work truck configuration for flatbed and crane body builds.

Sierra 3500HD SRW vs DRW

Unlike the 2500HD, the Sierra 3500HD is available in both SRW and DRW:

SRW Sierra 3500HD: Payload up to ~3,900 lbs. 84″ wide bodies standard. Best for light-to-medium service bodies, aluminum flatbeds, and landscape bodies where maneuverability matters.
DRW Sierra 3500HD: Payload up to ~4,534 lbs. 94″ wide bodies standard. Required for gooseneck towing at full capacity and heavy flatbed builds. Industry standard for serious work truck upfitting.

For most contractor, ranch, and fleet applications in Texas, the DRW Sierra 3500HD Duramax with 84″ CA is the go-to platform.

Best Flatbeds for 2025 Sierra 3500HD DRW

The Sierra 3500HD DRW is one of the most popular flatbed platforms in the South Texas market. Top choices from our lineup:

Bedrock Granite 9G — The #1 selling flatbed in our shop for DRW Sierra 3500HD trucks. 9’4″ x 94″, 25,000 lb gooseneck coupler, 2″x6″ steel frame. Excellent fitment and finish. If you’re pulling a gooseneck trailer with your Sierra 3500HD, this is the benchmark flatbed.
Norstar SD (94″) — Heavy-duty steel, built for the Texas work environment. Popular with ranchers running Sierra 3500HD Duramax trucks in South Texas and the Gulf Coast.
CM RD or CM SK — Proven, reliable welded steel flatbeds in 9’4″ x 94″ DRW sizing. The SK adds full-length rails and more headboard configurations popular on livestock farms.
Bradford Built — Premium powder-coat finish, multiple configurations. A step up in refinement for buyers who want a premium look with working-truck durability.

Best Flatbeds for 2025 Sierra 3500HD SRW

For SRW Sierra 3500HD trucks, 84″ wide flatbeds are proportional and correct:

CM RD (8’6″ x 84″) — The classic SRW choice. Clean skirted design, welded construction.
Aluma Aluminum Flatbed — Lightweight, corrosion-resistant. A great choice for SRW trucks where payload preservation matters.
Pronghorn — Lighter weight construction available in ranch and contractor configurations for SRW Sierra trucks.

Service Bodies for Sierra 3500HD

The Sierra 3500HD is a natural platform for service body builds across Texas contracting, utilities, and fleet work:

RKI Service Bodies (Houston, TX) — Contractor, combo, and crane-ready bodies. The RKI aluminum bodies are particularly well-suited to the Sierra 3500HD SRW where weight management is important. RKI steel bodies work great on the DRW variant.
STI Service Bodies — Standard and heavy-duty service bodies, mechanics truck bodies. STI’s lineup covers everything from basic utility bodies to full mechanics and lube truck configurations on the Sierra 3500HD chassis.

Sierra 3500HD Towing & Payload Summary

GVWR: Up to 13,200 lbs (SRW) / 14,000 lbs (DRW)
Max Payload: Up to ~4,534 lbs (DRW Duramax diesel)
Max Gooseneck Towing: Up to 36,000 lbs (DRW)
Engines: 6.6L V8 gas or 6.6L Duramax diesel (470 hp / 975 lb-ft)

Sierra 3500HD vs Ford F-350 for Upfitting

The Sierra 3500HD and Ford F-350 are closely matched in terms of upfitting capability. The F-350 has a slight edge in maximum payload in some configurations, while the Sierra 3500HD Duramax stands out for gooseneck towing. Both trucks accept the same brands and body sizes. If your crew runs GMC, the Sierra 3500HD is an excellent platform. See also our Ford F-350 truck bed guide for a direct comparison.

Get Your Sierra 3500HD Upfitted at Star Truck Equipment

Whether you’re building a flatbed ranch truck, a contractor service body, or a full crane body rig — Star Truck Equipment in Wharton, TX has the body brands, installation expertise, and Texas market knowledge to do it right. Call us at (979) 532-1486 or visit at 2507 County Rd 231, Wharton, TX.