What size hitch ball do I need?
Wrong ball size is the single most common reason a first-time renter has to make an extra trip to the auto parts store. It takes thirty seconds to check, and the answer is stamped on the trailer itself.
| Ball size | Typically used for | Typical rating |
|---|---|---|
| 1-7/8" | Small utility and light single-axle trailers | Up to ~2,000–3,500 lb |
| 2" | Most utility trailers, single-axle car haulers, many enclosed cargo trailers | Up to ~8,000 lb |
| 2-5/16" | Dump trailers, tandem-axle car haulers, deck-overs, larger enclosed | ~10,000–21,000 lb |
Before you leave the house, confirm four things
- Receiver size — measure the square opening: 1-1/4", 2" or 2-1/2".
- Ball size — must match the coupler stamp on the trailer you booked. It is on your confirmation email.
- Connector — 4-pin flat or 7-pin round. Electric brakes require 7-pin.
- Brake controller — required for any trailer with electric brakes.
Hitch and wiring questions
How do I know what size ball my trailer needs?
It is stamped directly on the trailer coupler — the part that drops over the ball. Look on the top or side and you will see "1-7/8", "2"" or "2-5/16"". Every trailer page on this site also lists the required ball size, and it is repeated in your booking confirmation email so you can check before you drive to the yard.
Can I use a 2-inch ball on a 2-5/16-inch coupler?
No, and this is genuinely dangerous — the coupler will appear to latch and then come off the ball over a bump. Ball size must match the coupler exactly. If you are unsure, bring the ball mount with you or send us a photo of your hitch before you come.
What is the difference between a 4-pin and a 7-pin connector?
A 4-pin (flat) plug carries running lights, brake lights and turn signals — enough for a small trailer with no brakes. A 7-pin (round) plug adds electric brakes, reverse and a charge line. Any trailer with electric brakes needs a 7-pin connector on your vehicle. Adapters exist for 7-pin trailer to 4-pin vehicle, but they do not create brake function that your vehicle does not have.
Do I need a brake controller?
If the trailer has electric brakes, yes — the controller is what tells them how hard to apply. Many trucks built from about 2015 onward have one integrated (look for a small gain/boost control near the steering column). If yours does not, an aftermarket controller is an inexpensive and common install. Each trailer listing states whether a controller is required.
What class is my hitch receiver?
Measure the square opening. 1-1/4 inch is Class I or II (light duty, roughly 2,000–3,500 lb). 2 inch is Class III or IV and covers most trucks and SUVs, up to roughly 8,000–10,000 lb. 2-1/2 inch is Class V heavy duty. The receiver itself usually has a sticker or stamp with its rating — and that rating, your vehicle tow rating and the ball rating are three separate limits. The lowest one wins.
What else should I check before I hook up?
Coupler fully seated and latched with the pin or clip in place. Safety chains crossed under the tongue in an X, with enough slack to turn. Electrical plugged in and lights tested — running, left, right and brake. Jack raised and stowed. Tires look properly inflated. Load secured with straps. Our checkout process walks you through this with photos and a short video, which is partly why we have very few problems on the road.
Do you supply the hitch ball?
You bring your own ball mount and correctly sized ball — it has to match your vehicle receiver height as well as the coupler. Any auto parts store in Fontana, Rialto or Ontario carries them for around $15–$40. Call 909-402-6600 if you want us to confirm the size for the specific trailer you booked.
Every trailer page lists its ball size
Check the trailer you want before you book — and it is repeated in your confirmation email.
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