What Size Trailer Hitch Do I Need?

WHAT SIZE TRAILER HITCH DO I NEED?

All you’re going to need is a measuring tape, your towing vehicle, and your trailer. Let’s get started!

* Each of our Weigh Safe Drawbars are going to be 3” longer than their listed drop length. (This is so the slider can fit on and still give you the listed drop). So the 4” is 7” in total length, the 6” is 9” in total length, and so on.

** If you are wanting/planning to buy the Weigh Safe 180° Hitch, please keep in mind that the bottom tow ball will hang lower by an extra 3” or so, when on the lowest height setting. So if this applies to you, simply add an extra 3” to the drop height.

When the slider is at the lowest point on the L-shaped draw bar, you will still have the second tow ball hanging down increasing the drop an additional 3″. We recommend the same scenario be followed by ensuring a minimum of 11″ of clearance from the bottom of the lowest hanging tow ball to the ground.

STEP 3: MEASURE THE CORRECT DROP OR RISE

If your trailer rides lower or higher than your truck, you will need a specific drop length that can be used to make up the difference and ensure the trailer is level. When loaded, both your truck and trailer must be level with the ground. If your trailer’s coupler sits higher than your receiver, you’ll need rise instead of drop. Measure from the bottom of your trailer’s coupler to the ground, then subtract your receiver height, and the difference is the amount of rise you need (for example, a 26″ coupler height − 20″ receiver height = 6″ of rise).

Choosing the right trailer hitch size for your rig is vital, because it can affect how your vehicle behaves on the road.

THE RELATIONSHIP BETWEEN HITCH SIZE AND TONGUE WEIGHT

A hitch size and rating are directly tied to its tongue weight—the downward force your trailer’s coupler places on the hitch. You want the tongue weight to fall within 10–15% of your gross trailer weight.

A hitch has to be rated to handle that downward force, not just sized to physically fit your receiver. If the weight placed on the tongue is outside this range, it won’t be able to deliver a consistently stable tow.

HOW IMPROPER HITCH SIZING CAN CAUSE TRAILER SWAY

When the tongue weight is too low, there is too much of the load sitting behind the trailer’s axle, causing the trailer to sway. This gets especially dangerous at higher speeds.

Too much tongue weight is caused by excess cargo sitting ahead of the trailer’s axle. This can overload the rear of the tow vehicle and push your vehicle’s back end around.

EFFECTS ON BRAKING, HANDLING, AND VEHICLE WEAR

Improper tongue weight doesn’t just affect stability—it changes how your vehicle stops and how quickly it wears out. In a real-world Weigh Safe road test, a trailer loaded with too much tongue weight (20%) took 22% farther to stop—an increase of 49 feet in braking distance.

The same imbalance accelerates wear across the vehicle: that one test pushed axle temperatures up 55%. Excessive tongue weight drives faster wear on suspension, brakes, wheel bearings, transmission, and tires. Sizing and loading your hitch correctly protects both your control of the vehicle and the components that keep it running.

Your hitch size determines the size for the specific fit and what the setup is rated to carry—tongue weight is the actual downward force for the hardware. Understanding how the two relate is what lets you match your equipment to your load correctly.

UNDERSTANDING TONGUE WEIGHT RATINGS

Every hitch and ball mount carries a maximum tongue weight rating alongside its gross trailer weight rating.

Tongue weight is the static, downward force your loaded trailer’s tongue places on the hitch, which always needs to sit within 10–15% of your gross trailer weight. That rating exists because a hitch isn’t just holding the trailer back—it’s bearing that constant downward load every mile, so the component has to be built to carry it.

MATCHING TONGUE WEIGHT TO HITCH CAPACITY

The right trailer hitch size involves your vehicle’s tow limits, because your towing capacity is always limited to the lowest-rated component in your setup.

A hitch rated well above your trailer’s tongue weight gives you margin, while one rated below it becomes the weak link, even if it fits your receiver.

Weigh Safe’s built-in scale lets you confirm your actual tongue weight to ensure you remain within your equipment’s capacity.

WHY PROPER WEIGHT DISTRIBUTION MATTERS

Tongue weight has to be within range for a safe tow, but it’s just as important to spread that weight across your axles.

A weight distribution hitch relocates tongue weight forward to the tow vehicle’s front axle and back to the trailer’s axles, so the whole rig sits level instead of squatting at the rear. This restores controlled steering and braking response and provides a more stable tow.

Weight distribution doesn’t increase how much you can tow—it balances the load you already have, which is why it works alongside correct hitch sizing rather than replacing it.

Once you know your receiver size and the drop or rise you need, the next choice is whether to go with an adjustable hitch or a fixed hitch. The right choice for you depends on how much your towing setup changes.

BENEFITS OF ADJUSTABLE HITCHES

An adjustable hitch lets you set the tow ball height in increments, so you can flip between drop and rise positions. One hitch can be adjusted to become level for different trailers. If your coupler heights vary—or you expect them to—adjustability means you’re not locked into a single height.

WHEN A FIXED HITCH MAKES SENSE

A fixed-height ball mount sets the tow ball at one height. If you consistently tow the same trailer at the same height, a fixed mount at the right height and tow rating provides exactly what you need without any adjustment.

Yes. One hitch can pull several trailers as long as it meets each trailer’s requirements for fit, height, and weight. The key is checking three things: ball size, coupler height, and weight rating.

WHEN ONE HITCH CAN HANDLE MULTIPLE TRAILERS

A single hitch works across multiple trailers when each one shares the same receiver size and falls within the hitch’s weight rating. An adjustable hitch widens that range further, since you can re-level it for trailers that ride at different heights.

BALL SIZE AND COUPLER COMPATIBILITY

Each trailer’s coupler is built for a specific ball size, commonly 1‑⅞”, 2″, or 2‑5/16″, and the ball must match the coupler exactly. If your trailers use different coupler sizes, you’ll need a hitch that lets you swap tow balls, like a dual-ball design, rather than assuming one ball fits all.

WHEN YOU NEED DIFFERENT DROP SETTINGS

Trailers that ride at different heights need different drop or rise settings to provide a level tow. An adjustable hitch handles this by re-setting the height for each trailer.

The following is a quick checklist to run through to help you avoid some common mistakes when choosing the right hitch:

• Assuming “more” is better: A larger receiver or higher-rated hitch doesn’t necessarily improve your tow. Your capacity is still capped by the lowest-rated component in your setup.
• Ignoring tongue weight ratings: Physical fit isn’t enough. Confirm the hitch is rated for your tongue weight, and keep that weight within 10–15% of your gross trailer weight.
• Choosing the wrong drop length: A hitch that doesn’t level your trailer creates sway and uneven wear. Measure your receiver and coupler heights, and pick the drop—or rise—that keeps your rig level.
• Forgetting ground clearance: A drop that’s too long can scrape on bumps and driveways, so keep at least 11″ of clearance.
• Exceeding vehicle or hitch capacity: Never tow beyond the limit of your weakest component. The lowest rating governs your entire setup.

Once you know your receiver size, the right drop or rise, and your tongue weight, you have the complete formula to choose the best Weigh Safe hitch for your setup. Our hitches provide you with a built-in scale, so it’s easy to be sure you’re carrying a safe load every time.

Got questions about your specific setup? Get in touch with us—we’re happy to help you find the right fit.

Now that you know what trailer hitch shank size and drop length you need, click the button below to purchase your Weigh Safe Hitch today! 

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