The 2025 Ram 3500 Heavy Duty is one of the most popular work trucks in Texas — and one of the best platforms for aftermarket truck bed upfitting. Whether you’re on a ranch in South Texas, running a contractor fleet out of Houston, or hauling equipment across the state, the Ram 3500 gives you the muscle to do it right. This guide covers the best truck bed options, fitment details, and key specs for the 2025 model year.
2025 Ram 3500 Cab-to-Axle (CA) Measurements
Ram 3500 CA specs for the 2025 model year:
- Regular Cab, Long Bed: CA ≈ 82.1″
- Crew Cab, Short Bed: CA ≈ 52.8″
- Crew Cab, Long Bed: CA ≈ 68.9″
Ram’s frame rail width differs slightly from Ford and Chevy, so always confirm Ram-specific mounting hardware when ordering. Most major brands (CM, Bedrock, Norstar) include Ram-specific mount kits or offer them as an add-on.
SRW vs DRW: The Biggest Decision for Ram 3500 Buyers
The Ram 3500 is available in both SRW and DRW configurations — and which one you choose has a major impact on your bed options:
- SRW Ram 3500: Standard rear track width. Compatible with all standard-width aftermarket flatbeds and service bodies. Maximum towing: up to 23,000 lbs (conventional). Easier to maneuver in tight spaces.
- DRW (Dually) Ram 3500: Wider rear stance, requiring DRW-specific bed widths (typically 96″+ overall). Maximum payload: up to 7,680 lbs. Maximum towing: up to 35,100 lbs (5th wheel). Ideal for serious gooseneck or fifth-wheel setups.
For most Texas ranchers and contractors regularly towing 20,000+ lbs, the DRW Ram 3500 with a matched DRW flatbed is the standard setup. For lighter use, SRW makes daily driving much easier.
Best Flatbed Options for the 2025 Ram 3500
Bedrock Granite 9G (SRW & DRW)
The Bedrock Granite 9G is our most popular flatbed install for Ram 3500 trucks. Built from 3/16″ A36 structural steel, it handles gooseneck loads without flex or fatigue. Available in both SRW and DRW widths, in 7’4″, 8’4″, and 9’4″ lengths. The Bedrock is a premium investment that will outlast the truck it’s bolted to.
CM RD, SK, and Warrior Series
CM Truck Beds builds three flatbed tiers that work well on the Ram 3500:
- RD Series — Bare flat deck, budget-friendly, workhorse durability
- SK Series — Adds front toolboxes, headache rack, and side rails
- Warrior Series — Premium steel construction with more deck features
All three come in SRW and DRW widths with Ram 2500/3500 mount kits. A great value option across all budget levels.
Norstar SD and RM Series
Norstar’s SD Series (standard deck) and RM Series (ranch model with taller sides) are Texas favorites. Made in the USA, sized for Ram 3500 SRW and DRW, and competitively priced. The RM with taller rails is a top choice for ranchers hauling hay, feed, and livestock.
Bradford Built Flatbeds
Bradford Built offers contractor-grade flatbeds with integrated toolboxes, under-body storage, and stake pocket rail systems. A smart choice for contractors who need job-site organization beyond a bare flat deck.
Aluma Aluminum Beds
For Ram 3500 owners who want to maximize usable payload, Aluma’s aluminum flatbeds save 200–400 lbs vs comparable steel beds. They’re also rust-proof — a real advantage in South Texas coastal humidity. Sized for Ram 3500 SRW.
Service Body Options for the Ram 3500
The Ram 3500’s higher payload capacity makes it an excellent service body candidate. With a max payload of ~5,220 lbs (DRW diesel), you can carry a full steel service body plus a substantial load of tools and materials. We install:
- RKI Aluminum Service Bodies — Lightweight with professional compartment organization
- CM Service Bodies — Steel, multiple length options for Ram 3500 CA specs
- STI Service Bodies — Heavy commercial duty for fleet applications
Gooseneck Towing Setup on the Ram 3500
The Ram 3500 DRW with a 6.7L Cummins diesel and aftermarket flatbed is the classic Texas gooseneck rig. To do it right:
- Choose a DRW-width flatbed with proper gooseneck ball position (typically 24″ from rear of bed)
- Confirm your flatbed installer mounts the ball to the truck’s frame, not just the bed floor
- Use a weight-rated gooseneck ball appropriate for your trailer load (30,000 lb balls are standard for heavy loads)
Get Your Ram 3500 Upfitted at Star Truck Equipment
We’re located at 2507 County Rd 231, Wharton, TX 77488 — easy access from Houston, Victoria, Corpus Christi, and the entire South Texas region. Ram 3500 upfits are a specialty of ours, and we stock both SRW and DRW options from the top brands.
Call (979) 532-1486 to get a quote or check current inventory. We’ll help you spec the right flatbed or service body for your Ram 3500 configuration.
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