Trailer Hitch and Tow Package: What Your Vehicle Needs to Tow

A hitch is one part. A tow package is a group of parts. Many people use the words interchangeably, and that causes confusion when renting a trailer.

A trailer hitch

The receiver hitch is a square tube bolted to the frame under your rear bumper. A ball mount slides in, a pin locks it, and the trailer couples to the ball. Some vehicles have a hitch but no wiring.

A tow package

A factory tow package typically bundles the hitch with trailer wiring and often extra cooling for the engine or transmission. Some packages include other towing-related parts. What is included depends on the maker and model, so check your window sticker or owner's manual.

Why it matters for a rental

A hitch alone may be enough for a small cargo trailer. A heavy auto transport or a large trailer typically needs a vehicle properly equipped for towing. We check your vehicle when you call (909) 608-7699.

Receiver hitches are grouped into classes by how much they are built to handle. The class and ratings are printed on a label on the hitch. The general pattern looks like this:

These are general groupings. Always read the actual label on your hitch for its maximum trailer weight and tongue weight. Your vehicle's own towing capacity may be lower than the hitch rating, and the lower number wins.

Start with the owner's manual. It lists towing capacity, often with conditions such as engine, axle ratio or package. Then check the labels on your vehicle and hitch.

1. Owner's manual: maximum towing capacity and any tow package requirements.
2. Door jamb labels: weight ratings and tire information for your vehicle.
3. Hitch label: maximum trailer weight and tongue weight for the receiver.
4. Ball mount and ball: their own stamped ratings.

Your safe limit is the lowest of these numbers. When you call to reserve, give us your year, make and model, and we check it against U-Haul's requirements for the trailer you want. The towing equipment page explains each part in more detail.

The ball mount sets the height of the ball, and the ball must match the trailer coupler. Get either wrong and the trailer tows poorly or unsafely.

Ball mount drop or rise

The goal is a trailer that sits roughly level when coupled. If your vehicle sits high, like many pickups, you need a mount with a drop. If it sits low, you may need less drop or a rise. A trailer that tilts nose-down or nose-up can handle badly.

Ball size

Common sizes are 1-7/8 inch, 2 inch and 2-5/16 inch. The size is stamped on top of the ball, and the coupler lists the size it needs. They must match exactly.

Ball tightness

The ball nut must be tight. A ball that spins or wobbles on the mount needs attention before towing. At pickup, we check all three.

Your trailer's running lights, turn signals and brake lights all depend on your vehicle's wiring. Many vehicles with a hitch have a connector near it, often a 4-pin flat plug or a round 7-pin plug. Some have a hitch and no wiring at all.

Common wiring problems we see:

• Corroded pins from years without use
• A loose or broken ground wire
• A blown fuse for the trailer circuit
• Damaged wires near the bumper

We test every light function with the trailer connected. If something fails in your vehicle wiring, we explain it and write an estimate before any repair. Our hitch and tow package inspection service covers deeper wiring diagnosis.

Tongue weight is the downward push of the trailer on your hitch ball. Your hitch has a maximum tongue weight rating on its label, and general towing guidance puts good tongue weight at roughly 10 to 15 percent of the loaded trailer weight.

• Too light: the trailer can sway, especially at speed.
• Too heavy: the rear of your vehicle squats, the front lifts, and steering and braking feel light.
• Over the hitch rating: stresses the receiver and frame.

Load heavy items low and just ahead of the trailer axle, balance side to side, and look at your vehicle from the side once hooked up. The free towing inspection page explains how we check stance at pickup.

Towing puts extra load on your rear tires and makes your brakes work much harder, especially on long downhill grades. A setup with a perfect hitch can still be unsafe on worn tires or thin pads.

What we look at in the same visit:

• Tire tread and wear pattern: uneven wear can signal alignment or suspension issues.
• Tire age: old rubber can fail under load even with good tread.
• Tire pressure and load capacity: many vehicles list a higher pressure for loaded conditions on the door placard.
• Brake pads: thickness and signs of overheating.
• Obvious leaks: brake fluid, transmission fluid or coolant.

You get a written estimate split into need and want. Read our brake service page for how brake inspections work, and the tire date code guide to check tire age yourself.

Also check your tow vehicle for open recalls at NHTSA (opens in a new tab) before a long pull.

Sort that out before you reserve a trailer. A trailer reservation without a working hitch on your vehicle leads to a wasted trip on pickup day. Call (909) 608-7699 and describe your vehicle. We tell you plainly what it needs and what we can help with, and whether another option, like a moving truck, makes more sense for your move.

If your vehicle already has a hitch that has not been used in years, bring it in before moving day. Rust, a seized ball or dead wiring is much easier to handle during the week than on the morning of your move.

Towing ratings come with a lot of letters. Knowing the main terms helps you read your manual and door labels with confidence.

Tongue weight counts against payload. A pickup full of people and boxes can hit its payload limit before it hits its towing capacity. Add up the passengers, cargo and tongue weight, and compare that total to the payload figure on the door jamb label.

Towing makes the engine and transmission work harder for longer, and heat is what wears them out. That is why many factory tow packages add extra cooling. Grades such as the I-15 through Cajon Pass make the load even heavier.

Signs your vehicle is struggling:

• The temperature gauge climbs above its usual spot
• The transmission shifts back and forth on hills
• A burning smell after a long climb
• Coolant or transmission fluid spots under the vehicle

How to help it:

1. Use tow or haul mode if your vehicle has one.
2. Let speed fall on climbs instead of forcing it.
3. Turn off the air conditioning if the engine runs hot.
4. Have old coolant and transmission fluid looked at before a big tow.

Our cooling system service page explains what we check, and our transmission service covers fluid condition after heavy towing.