How can I tell what class hitch I have on my truck?
The hitch class is defined by the receiver size and its published weight rating. The quickest way to tell is to measure the receiver opening (1-1/4" vs 2" vs 2-1/2") and read any stamped or labeled ratings or the model number on the hitch. If needed, consult the vehicle manual or the hitch manufacturer for confirmation.
In this guide, you’ll learn practical, at-a-glance checks and documentation-based steps to identify your hitch class accurately, so you can tow safely and within the correct limits.
Key indicators to identify your hitch class
Use these basic checks to determine the class from what you can see on or with the hitch. Start with the simplest physical clues and then verify with documentation if needed.
- Receiver opening size: Measure the inside width of the hitch receiver. Common sizes are 1-1/4" (Class I/II), 2" (Class III/IV), and 2-1/2" (Class V). A ruler or caliper works well for this quick check.
- Stamped or cast weight rating on the hitch: Look for forged or stamped numbers such as GTW (gross trailer weight) and TW (tongue weight) or a direct “Class” designation on the crossmember or collar.
- Label or tag on the hitch: Some aftermarket and OEM hitches carry a metal plate or sticker with the class (e.g., Class III) and maximum rating.
- Manufacturer or model number: If you can find a part number, you can look up the exact class and ratings in the manufacturer's catalog or retailer listing.
- Vehicle or installation documentation: The vehicle’s owner’s manual, window sticker (if installed by a dealer), or hitch installation sheet may specify the recommended or installed class.
- OEM vs aftermarket markings: Some OEM hitches follow vehicle-specific ratings, while aftermarket hitches may have a broader range; always verify the exact rating for your setup.
These checks cover the most common ways people identify hitch class without disassembly. If the numbers don’t align with typical class definitions, rely on the part number and manufacturer documentation for confirmation.
How to verify using measurements and documentation
When the quick checks aren’t conclusive, use these steps to confirm the class through measurements and official documentation.
- Measure the receiver opening precisely: Confirm whether it is 1-1/4", 2", or 2-1/2" in internal width. This usually maps to Class I/II, Class III/IV, or Class V, respectively.
- Read the rating stamps on the hitch: Note GTW (gross trailer weight) and TW (tongue weight) values printed on the receiver or crossmember. Compare these to standard class ranges.
- Check the class designation if stamped or labeled: Some hitches explicitly say “Class III” or “Class IV” on the receiver top or side.
- Consult the model number and lookup the spec sheet: Use the hitch’s model number to pull the official class rating from the manufacturer’s website or a trusted retailer.
- Cross-check with the vehicle’s documentation: The owner’s manual or dealer-installed hitch paperwork should confirm the supported class for your truck.
Following these steps will typically yield a definitive answer. If anything remains unclear, contact the hitch manufacturer or a qualified trailer shop to avoid mismatching a hitch with unsafe towing limits.
Summary
To determine your hitch class, start with the receiver size and any published ratings on the hitch itself. If labels are unclear, use the model number to look up the official specifications, and verify against your vehicle’s documentation. When in doubt, consulting a professional ensures you tow within the proper class limits and maintain safe towing practices.
