Hitches, Receivers & Ball Mounts
Class 4 vs Class 5 Hitch
The jump from class 4 to class 5 is the one that changes the receiver opening - and with it, every accessory you already own.
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Short answer
Class 4 and class 5 both cover heavy towing, but class 5 is where the receiver tube commonly grows from 2 in to 2-1/2 in. That single change makes your existing ball mounts, pins and accessories unusable without an adapter.
Hitch classes describe capacity bands, and they are set by the hitch manufacturer rather than by a regulator. The useful way to read the class system is not as a ladder of strength but as a sequence of physical changes - and the class 4 to class 5 step is the one where the physical change bites.
Where class 4 sits
A class 4 receiver uses a 2 in square tube, the same opening as a class 3, and covers the upper end of what a half-ton and most three-quarter-ton trucks are asked to pull. Every ball mount, drop hitch, bike rack, cargo carrier and anti-rattle pin sold for the 2 in standard fits it. In practice, class 4 is where most heavy travel-trailer towing happens.
Where class 5 starts
Class 5 covers the heaviest conventional towing, and it is normally split into two sub-families. Some class 5 receivers keep a 2 in opening with higher ratings; many use a 2-1/2 in opening, and the heaviest commercial-style hitches use 3 in. The moment the opening changes, your accessory collection does not transfer. A 2 in mount in a 2-1/2 in tube is not a tight fit with a shim - it is the wrong part.
| Consideration | Class 4 | Class 5 |
|---|---|---|
| Typical receiver opening | 2 in square | 2 in, 2-1/2 in or 3 in depending on the hitch |
| Accessory compatibility | The full 2 in aftermarket | Dedicated 2-1/2 in parts, or an adapter |
| Typical pin diameter | 5/8 in | 5/8 in, or larger on 2-1/2 in and 3 in tubes |
| Usual vehicles | Half-ton and three-quarter-ton trucks and large SUVs | Three-quarter-ton, one-ton and chassis-cab trucks |
| Weight distribution | Commonly required at the top of the range | Commonly required, and often a separate rating |
| What usually binds first | Payload on the tow vehicle | Payload, or the trailer's own rating |
Class ranges are set by hitch manufacturers, not by federal rule. Always use the rating printed on your own receiver rather than the class name.
How to tell which one you actually need
- Measure the receiver opening you already have. A tape measure across the square tube settles the accessory question immediately. The full sizes chart lists what each opening normally implies.
- Read the rating label, not the class. Two numbers, weight-carrying and weight-distributing. The class name is marketing shorthand; the label is the specification.
- Check your payload before your hitch class. A class 5 receiver on a truck with 1,400 lb of payload does not let you carry a 1,800 lb tongue. Payload and tow rating are different limits and payload is almost always the one you run out of.
- Decide whether you are really in gooseneck territory. Above a certain tongue weight, a conventional receiver stops being the sensible answer at all - gooseneck and fifth wheel put the load ahead of the rear axle instead.
What to look for in the hardware
- Mounts rated above your actual tongue weight, not at it. Ratings on adjustable mounts are usually stated as a gross trailer weight and a tongue weight; both have to clear your numbers.
- Correct pin diameter for the tube. Buying a 5/8 in pin for a larger tube leaves slop, and slop is wear.
- Slop control. At class 4 and 5 loads the clunk at every gear change is the mount moving in the tube. An anti-rattle pin and shim is the cheapest fix on the whole rig.
- Tongue weight awareness. At this end of the scale the difference between 12 and 15 percent is a couple of hundred pounds of payload, so a mount that reads tongue weight as you hitch pays for itself in decisions.
Quick picks
Tap any row to jump to the full write-up. How these are chosen - and what we do and do not claim to know - is published in full on our research methodology page.
| # | Product | Best for | Our read | Price |
|---|---|---|---|---|
| 1 |  CURT Adjustable Channel Mount with Dual Ball (2 in shank, 6 in drop) Best mount for class 4 | Garages with several trailers | 14,000 lb gross, two ball sizes, 6 in drop | Check price on Amazon #ad Affiliate link - we publish no price; Amazon shows the current one |
| 2 |  Weigh Safe Adjustable Drop Hitch with Built-in Tongue Weight Scale Best for heavy tongues | Owners who will never visit a scale | Reads tongue weight as you hitch | Check price on Amazon #ad Affiliate link - we publish no price; Amazon shows the current one |
| 3 |  CURT Anti-Rattle Hitch Pin and Shim (2 in receiver) Cheapest worthwhile addition | Killing receiver rattle | Removes receiver slop for pocket money | Check price on Amazon #ad Affiliate link - we publish no price; Amazon shows the current one |
1. Best mount for class 4
CURT Adjustable Channel Mount with Dual Ball (2 in shank, 6 in drop)
CURT · Best for garages with several trailers
One mount that covers two ball sizes and a range of heights, which is the answer when the garage contains a boat trailer, a utility trailer and a camper that all sit at different heights. Capacity drops to the lower-rated ball you are actually using.
Published specifications
What works
- Two ball sizes and a height range in a single mount
- Flipping it gives rise as well as drop
- Rated to 14,000 lb on the larger ball
What does not
- Heavy, and more joints means more places for rattle to start
- The pins and bolts need checking for torque, unlike a one-piece mount
Skip it if
Pointless if you own one trailer and tow it with one truck - a fixed mount at the right height is lighter, quieter and cheaper.
#ad Affiliate link - we publish no price; Amazon shows the current one
Raw specifications: CURT’s own page. We earn nothing on that link.
2. Best for heavy tongues
Weigh Safe Adjustable Drop Hitch with Built-in Tongue Weight Scale
Weigh Safe · Best for owners who will never visit a scale
An adjustable drop hitch with a hydraulic gauge in the shank, so the tongue weight reads out as you lower the trailer onto the ball. It turns the single most-skipped step in towing into something that happens automatically, which is worth more than the hardware itself.
We have not sourced a full specification table for this model from the manufacturer’s own site at a stable address. Rather than repeat figures we cannot cite, the assessment above is limited to what the design and the maker’s published description genuinely establish.
What works
- Reads tongue weight every time you hitch, with no extra step
- Adjustable height and reversible for rise as well as drop
- Makes the 10-15 percent rule checkable instead of theoretical
What does not
- The gauge reads at the ball, so it is sensitive to being parked on a slope
- Heavier and considerably more expensive than a plain mount
Skip it if
Not needed if you already weigh at a public scale - the gauge is convenience, and a certified scale is still the more accurate number.
#ad Affiliate link - we publish no price; Amazon shows the current one
Raw specifications: Weigh Safe’s own page. We earn nothing on that link.
3. Cheapest worthwhile addition
CURT Anti-Rattle Hitch Pin and Shim (2 in receiver)
CURT · Best for killing receiver rattle
A pin plus a wedge shim that takes the slop out of the gap between a 2 in mount and a 2 in receiver. That gap is a manufacturing tolerance, not a fault, and this is the cheapest thing on the whole site that fixes a real, daily annoyance.
Published specifications
What works
- Removes the clunk over expansion joints for very little money
- Fits in a glovebox and transfers between vehicles
- No modification to the receiver or the mount
What does not
- Does nothing about rattle originating at the coupler or the sway bar
- Listed as superseded, so check the current item number
Skip it if
Not the fix if the noise is coming from a loose ball nut or a worn coupler - find the source first, because a shim will just mask it.
#ad Affiliate link - we publish no price; Amazon shows the current one
Raw specifications: CURT’s own page. We earn nothing on that link.
If your receiver turns out to be a 2 in class 4 rather than a class 5, that is usually good news: the hardware is cheaper, lighter and universally available. The only honest reason to move up is a trailer that genuinely exceeds the rating printed on the receiver you have.
Key takeaways
- The class 4 to class 5 step often changes the receiver opening to 2-1/2 in.
- A different opening means new mounts, new pins and new accessories.
- Read the rating label on your receiver, not the class name.
- Payload, not hitch class, is what usually limits heavy towing.
How we sourced this
Every figure on this page came from one of the following, each fetched while the page was written. Where a manufacturer or regulator does not publish a number, we say so rather than estimate it.
Common questions
- Is a class 5 hitch stronger than a class 4?
- In rating terms yes, but the useful difference is physical: a larger receiver opening on many class 5 hitches, with its own accessory ecosystem. Compare the ratings printed on the two specific hitches rather than relying on the class label.
- Can I put a 2 in ball mount in a 2-1/2 in receiver?
- Only with a step-up adapter, and the adapter's own rating then becomes the limit of the whole assembly. It also moves the load further back, which increases leverage on the receiver. Use a 2-1/2 in mount where one exists for your need.
- Do I need a weight distribution hitch with a class 4 or class 5 receiver?
- That depends on your measured tongue weight against the receiver's weight-carrying rating, not on the class. Both classes commonly publish a higher weight-distributing rating that only applies when such a hitch is fitted.
More in Hitches, Receivers & Ball Mounts
Class, receiver size, ball diameter, drop. Four numbers decide whether your setup is right, and three of them are stamped on parts you already own.
Read next
Reference
Hitch Classes Explained
The class system from 1 to 5, the two ratings on every label, and the mistake of inferring capacity from tube size.
Head to head
Class 3 vs Class 4
What actually separates the two classes, and the common situation where upgrading the receiver changes nothing.
Reference
Receiver Sizes Chart
Tube sizes, pin hole diameters, what fits what, and the derating that comes with a reducer sleeve.
Guide
2 in Receiver Adapters
Step-up, step-down and extension adapters explained, what each one does to your rating, and the cases where buying the correct mount is the only sensible route.
Found something out of date, or a figure you can source better than we did? Corrections get read first. How we research explains how these pages are put together, and contact is one click away.