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SRW and DRW describe the number of road wheels on the rear axle, not merely a trim or appearance package.
Physical identification
An SRW pickup has one road wheel at each end of the rear axle. A DRW pickup has paired rear wheels on each side and a wider rear body or fender treatment to cover them.
Why the distinction matters
Rear-wheel configuration can change payload, rear-axle and tire context, width, tire count and the model-year towing tables that apply. Do not transfer an SRW rating to a DRW truck—or the reverse.
Verify beyond appearance
Confirm the model, certification label, tire information and manufacturer documentation. Modified wheels or bodywork are a reason to investigate the configuration rather than guess.
Confirm the original configuration before comparing labels
SRW has one wheel on each side of the rear axle; DRW has two. Wider rear bodywork can be a clue, but wheel adapters or a body conversion mean appearance alone is insufficient. Compare the original build information with the axle, wheels, tires and certification labels now present.
| Check | Why it matters |
|---|---|
| Original SRW or DRW build | Establishes the documented starting configuration |
| Wheel and tire markings | Helps identify suitable components and replacements |
| Conversion documentation | Reveals changes that need qualified assessment |
Inspect the inner tires on a dually
Ask for access to inner sidewalls, valves and the space between paired tires. Record tire sizes and condition across the axle rather than inspecting only the visible outer pair. Added rear tires do not independently establish a higher vehicle rating; use the documented configuration and actual load limits when comparing two trucks.
General educational content for Canadian diesel-pickup research. Verify the exact truck, model year, certification labels, owner manual and manufacturer documentation, and obtain qualified mechanical or towing advice where appropriate.
Sources & Further Verification
Use the exact model year, VIN, truck labels and current manufacturer documentation when moving from general research to a purchase or towing decision.