When you’re shopping for a CM service body, two models come up again and again: the CM SK and the CM SRX. Both are built tough. Both are made in the USA. But they serve different kinds of workers — and picking the wrong one can leave you short on storage or hauling more truck than you need.
At Star Truck Equipment in Wharton, TX, we spec and install CM service bodies for contractors, oilfield workers, and trades all across Texas and Louisiana. Here’s a straight-up comparison to help you decide.
CM SK Service Body Overview
The CM SK is CM’s standard single-rear-wheel (SRW) service body — designed to fit on ¾-ton and 1-ton pickups like the Ford F-250, Ram 2500, and Chevy Silverado 2500HD. It’s available in lengths from 8 to 9 feet and comes with integrated toolboxes on both sides.
- Fits SRW trucks (F-250, Ram 2500, Silverado 2500HD)
- 8–9 ft body lengths available
- Standard compartment doors with slam latches
- Powder-coat finish — no galvanized option needed
- Integrated headache rack and utility rail
- Lighter weight — better for payload-sensitive applications
The SK is the go-to choice for plumbers, HVAC techs, and electricians who need organized tool storage on a standard-duty pickup. It handles daily trade work without overloading your truck’s rear axle.
CM SRX Service Body Overview
The CM SRX is CM’s heavier-duty service body — built for dually (DRW) trucks and cab-chassis configurations. It steps up in width, payload capacity, and compartment count, giving fleet operators and oilfield crews significantly more room to work with.
- Designed for DRW trucks and cab-chassis (F-350 DRW, Ram 3500 DRW, F-450, Ram 4500)
- Wider body to span dually rear fenders
- More compartments and deeper storage bins
- Higher payload capacity — handles heavier tool loads
- Better suited for commercial fleet and oilfield applications
If you’re running a fleet of service trucks, stocking heavy tools, or working in oil and gas where your service body gets loaded to the brim every day — the SRX is the right call.
Key Differences at a Glance
| Feature | CM SK | CM SRX |
|---|---|---|
| Truck Type | SRW (¾-ton, 1-ton) | DRW / Cab-Chassis |
| Body Width | Standard (fits SRW fenders) | Wider (spans DRW fenders) |
| Compartments | Standard count | More compartments, deeper bins |
| Payload Rating | Light-to-medium duty | Medium-to-heavy duty |
| Best For | Trades (electrical, plumbing, HVAC) | Fleet, oilfield, heavy commercial |
| Price Point | Lower | Higher |
Which One Should You Choose?
Choose the CM SK if:
- You’re driving a ¾-ton or standard 1-ton pickup (SRW)
- Your daily workload is trade-based (plumbing, electrical, HVAC)
- You want a lighter body to preserve payload capacity
- Budget is a consideration and you don’t need the extra width
Choose the CM SRX if:
- You’re running a dually or cab-chassis truck
- You carry heavy tools, parts, or equipment daily
- You’re building out a commercial fleet or oilfield service truck
- You need more compartment space and a wider workspace
If you’re not sure which chassis you’re working with, check your truck’s rear axle configuration. SRW (single rear wheel) trucks have a single tire on each side of the rear axle. DRW (dual rear wheel, or “dually”) trucks have two tires on each side — and that extra width means you’ll need the SRX to fit properly over the fenders.
Both Bodies. One Dealer. Wharton, TX.
Star Truck Equipment stocks and installs both the CM SK and CM SRX service bodies in Wharton, TX. We serve contractors, fleets, and trades across Texas and Louisiana — from Houston to Baton Rouge.
Call us at (979) 532-1486 to talk through your truck specs, your payload needs, and which CM service body makes the most sense for your operation. We’ll get it spec’d right and installed fast.
Browse our full lineup of service bodies for sale or check out our truck body blog for more comparison guides.
