Toyota Tundra Owners Manual: Trailer towing

Contact your Toyota dealer for further information about additional requirements such as a towing kit, etc.

Towing related terms

■ GCWR (Gross Combination Weight Rating) The maximum allowable gross combination weight. The gross combination weight is the sum of the total vehicle weight (including the occupants, cargo and any optional equipment installed on the vehicle) and the weight of the trailer being towed (including the cargo in the trailer).

■ GVWR (Gross Vehicle Weight Rating) The maximum allowable gross vehicle weight. The gross vehicle weight is the total weight of the vehicle. When towing a trailer, it is the sum of the vehicle weight (including the occupants, cargo and any optional equipment installed on the vehicle) and the tongue weight.

■ GAWR (Gross Axle Weight Rating) The maximum allowable gross axle weight. The gross axle weight is the load placed on each axle (front and rear).

■ TWR (Trailer Weight Rating) The maximum allowable gross trailer weight. The gross trailer weight is the sum of the trailer weight and the weight of the cargo in the trailer.

TWR is calculated assuming base vehicle with one driver, one front passenger, towing package (if available), hitch and hitch systems (if required).

Additional optional equipment, passengers and cargo in the vehicle will reduce the trailer weight rating so as not to exceed GCWR, GVWR and GAWR.

If the gross trailer weight exceeds 3000 lb. (1360 kg), it is recommended to use a trailer with 2 or more axles.

■ Unbraked TWR (Unbraked Trailer Weight Rating) The trailer weight rating for towing a trailer without a trailer service brake system.

■ Tongue Weight The load placed on the trailer hitch ball.

■ Kingpin Weight The load placed on the 5th wheel mount or the gooseneck ball.

Weight limits

• The gross trailer weight must never exceed the TWR described in the table.
• The gross combination weight must never exceed the GCWR described in the table.
• The gross vehicle weight must never exceed the GVWR indicated on the Certification Label.
• The gross axle weight on each axle must never exceed the GAWR indicated on the Certification Label.

• If the gross trailer weight is over the unbraked TWR, trailer service brakes are required.
• If the gross trailer weight is over 2000 lb. (907 kg), a sway control device with sufficient capacity is required.
• If the gross trailer weight is over 5000 lb. (2268 kg), a weight distributing hitch with sufficient capacity is required.

GCWR, TWR, Unbraked TWR, Fifth wheel and Gooseneck towing TWR

Confirm that the gross trailer weight, gross combination weight, gross vehicle weight, gross axle weight and tongue weight are all within the limits.

■ GCWR*5 and TWR*5

Double Cab models

*5: These models meet the tow-vehicle trailering requirement of SAE International per SAE J2807.

*1: The model code is indicated on the Certification Label.
*2: Vehicles without towing package
*3: Vehicles with towing package
*4: Vehicles with towing package and large fuel tank

CrewMax models

*1: The model code is indicated on the Certification Label.
*2: Vehicles without towing package
*3: Vehicles with towing package
*4: Vehicles with towing package and large fuel tank

■ Unbraked TWR*5 1000 lb. (453 kg)

*5: These models meet the tow-vehicle trailering requirement of SAE International per SAE J2807.

Trailer Tongue Weight and Trailer Kingpin Weight

• A recommended tongue weight or kingpin weight varies in accordance with the types of trailers or towing as described below.
• To ensure the recommended values shown below, the trailer must be loaded by referring to the following instructions.

1. Conventional Towing

The gross trailer weight should be distributed so that the tongue weight is 9% to 11%. (Tongue Weight/Gross trailer weight x 100 = 9% to 11%)

1. Gross trailer weight
2. Tongue Weight

If using a weight distributing hitch when towing, return the front axle to the same weight as before the trailer connection.

If front axle weight cannot be measured directly, measure the front fender height above the front axle before connection. Adjust weight distributing hitch torque until front fender is returned to the same height as before connection.

Do not reduce front fender height below original measurement.

The gross trailer weight, gross axle weight and tongue weight can be measured with platform scales found at a highway weighing station, building supply company, trucking company, junk yard, etc.

2. Fifth wheel Towing or Gooseneck Towing

The gross trailer weight should be distributed so that the kingpin weight is 14% to 16%. (Kingpin weight/Gross trailer weight x 100 = 14% to 16%)

1. Gross trailer weight
2. Kingpin weight

The gross trailer weight and kingpin weight can be measured with platform scales found at a highway weighing station, building supply company, trucking company, junk yard, etc.

CrewMax models: Current fifth wheel trailer designs are not compatible with short bed.

Hitch

Trailer hitch assemblies have different weight capacities. Toyota recommends the use of Toyota hitch/bracket for your vehicle. For details, contact your Toyota dealer.

• If you wish to install a trailer hitch, contact your Toyota dealer.
• Use only a hitch that conforms to the gross trailer weight requirement of your vehicle.
• Follow the directions supplied by the hitch manufacturer.
• Lubricate the hitch ball and kingpin with a light coating of grease.
• Remove the trailer hitch whenever you are not towing a trailer. After removing the hitch, seal any mounting hole in the vehicle body to prevent entry of any substances into the vehicle.

Bumper towing (vehicles with steel bumper only)

The rear bumper of your vehicle is equipped with a hole to install a trailer ball. If you have any questions, contact your Toyota dealer.

The gross trailer weight (trailer weight plus cargo weight) when towing with the bumper must never exceed the TWR or 5000 lb. (2268 kg) whichever is lower.

Selecting trailer ball

Use the correct trailer ball for your application.

1. Trailer ball load rating
   Matches or exceeds the gross trailer weight rating of the trailer.
2. Ball diameter
   Matches the size of the trailer coupler.

   Most couplers are stamped with the required trailer ball size.

3. Shank length
   Protrudes beyond the bottom of the lock washer and nut by at least 2 threads.
4. Shank diameter
   Matches the ball mount hole diameter size.

Positions for towing hitch receiver

1. Hitch receiver pin hole position: 46.4 in. (1179 mm)

Connecting trailer lights

Use the wire harness stored in the rear end of the vehicle.

The tow lighting system is designed for 64 watts/5 amps of electrical current per side (right and left) for the trailer brake/turn light functions.

Please contact your Toyota dealer with any questions or concerns.

Vehicles without towing package

Vehicles with towing package

■Service connector for towing brake controllers (vehicles without an installed trailer brake controller) Your vehicle is equipped with a service connector for supplemental trailer brake controllers.

Please consult your dealer on how to access the service connector.

Trailer towing tips

Your vehicle will handle differently when towing a trailer. To help avoid an accident, death or serious injury, keep the following in mind when towing:

• Speed limits for towing a trailer vary by state or province. Do not exceed the posted towing speed limit.
• Toyota recommends that the vehicle-trailer speed limit is 65 mph (104 km/h) on a flat, straight, dry road. Do not exceed this limit, the posted towing speed limit or the speed limit for your trailer as set forth in your trailer owner's manual, whichever is lowest. Instability of the towing vehicle-trailer combination (trailer sway) increases as speed increases. Exceeding speed limits may cause loss of control.
• Before starting out, check the trailer lights, tires and the vehicle-trailer connections. Recheck after driving a short distance.
• Practice turning, stopping and reversing with the trailer attached in an area away from traffic until you become accustomed to the feel of the vehicle-trailer combination.
• Reversing with a trailer attached is difficult and requires practice.

  Grip the bottom of the steering wheel and move your hand to the left to move the trailer to the left. Move your hand to the right to move the trailer to the right. (This is generally opposite to reversing without a trailer attached.) Avoid sharp or prolonged turning. Have someone guide you when reversing to reduce the risk of an accident.

• As stopping distance is increased when towing a trailer, vehicle-to-vehicle distance should be increased. For each 10 mph (16 km/h) of speed, allow at least one vehicle and trailer length.
• Avoid sudden braking as you may skid, resulting in the trailer jack-knifing and a loss of vehicle control. This is especially true on wet or slippery surfaces.
• Avoid jerky starts or sudden acceleration.
• Avoid jerky steering and sharp turns, and slow down before making a turn.
• Note that when making a turn, the trailer wheels will be closer than the vehicle wheels to the inside of the turn. Compensate by making a wider than normal turning radius.
• Slow down before making a turn, in crosswinds, on wet or slippery surfaces, etc.

  Increasing vehicle speed can destabilize the trailer.

• Take care when passing other vehicles. Passing requires considerable distance. After passing a vehicle, do not forget the length of your trailer, and be sure you have plenty of room before changing lanes.
• To maintain engine braking efficiency and charging system performance when using engine braking, do not use the transmission in D.

  Transmission shift range position must be in 4 in the S mode.

• Instability happens more frequently when descending steep or long downhill grades. Before descending, slow down and downshift. Do not make sudden downshifts while descending steep or long downhill grades.
• Avoid holding the brake pedal down too long or applying the brakes too frequently. This could cause the brakes to overheat and result in reduced braking efficiency.
• Due to the added load of the trailer, your vehicle's engine may overheat on hot days (at temperatures over 85ºF [30ºC]) when driving up a long or steep grade. If the engine coolant temperature gauge indicates overheating, immediately turn off the air conditioning (if in use), pull your vehicle off the road and stop in a safe spot.
• Always place wheel blocks under both the vehicle's and the trailer's wheels when parking. Apply the parking brake firmly, and put the transmission in P. Avoid parking on a slope, but if unavoidable, do so only after performing the following:

1. Apply the brakes and keep them applied.
2. Have someone place wheel blocks under both the vehicle's and trailer's wheels.
3. When the wheel blocks are in place, release the brakes slowly until the blocks absorb the load.
4. Apply the parking brake firmly.
5. Shift into P and turn off the engine.

• When restarting after parking on a slope:

1. With the transmission in P, start the engine. Be sure to keep the brake pedal pressed.
2. Shift into D or R (if reversing).
3. Release the parking brake and brake pedal, and slowly pull or back away from the wheel blocks. Stop and apply the brakes.
4. Have someone retrieve the blocks.

■Matching trailer ball height to trailer coupler height No matter which class of tow hitch applies, for a more safe trailer hookup, the trailer ball setup must be the proper height for the coupler on the trailer.

1. Coupler
2. Trailer ball

■Before towing Check that the following conditions are met:

• Ensure that your vehicle's tires are properly inflated.
• Trailer tires are inflated according to the trailer manufacturer's recommendation.
• All trailer lights work as required by law.
• All lights work each time you connect them.
• The trailer ball is set at the proper height for the coupler on the trailer.
• The trailer is level when it is hitched.

  Do not drive if the trailer is not level, and check for improper tongue weight, overloading, worn suspension, or other possible causes.

• The trailer cargo is securely loaded.
• The rear view mirrors conform to all applicable federal, state/provincial or local regulations. If they do not, install rear view mirrors appropriate for towing purposes.
• Depress TOW/HAUL button (if equipped).
• The manual headlight leveling dial is correctly adjusted.

■Break-in schedule If your vehicle is new or equipped with any new power train components (such as an engine, transmission, differential or wheel bearing), Toyota recommends that you do not tow a trailer until the vehicle has been driven for over 500 miles (800 km).

After the vehicle has been driven for over 500 miles (800 km), you can start towing. However, for the next 500 miles (800 km), drive the vehicle at a speed of less than 50 mph (80 km/h) when towing a trailer, and avoid full throttle acceleration.

■Maintenance

• If you tow a trailer, your vehicle will require more frequent maintenance due to the additional load. (See "Owner's Warranty Information Booklet" or "Scheduled Maintenance Guide"/"Owner's Manual Supplement".)
• Retighten the fixing bolts of the towing ball and bracket after approximately 600 miles (1000 km) of trailer towing.

■If trailer sway occurs One or more factors (crosswinds, passing vehicles, rough roads, etc.) can adversely affect handling of your vehicle and trailer, causing instability.

• If trailer swaying occurs:
  • Firmly grip the steering wheel. Steer straight ahead.

    Do not try to control trailer swaying by turning the steering wheel.

  • Begin releasing the accelerator pedal immediately but very gradually to reduce speed.

    Do not increase speed. Do not apply vehicle brakes.

If you make no extreme correction with the steering or brakes, your vehicle and trailer should stabilize. (if enabled, Trailer Sway Control can also help to stabilize the vehicle and trailer.)

• After the trailer swaying has stopped:
  • Stop in a safe place. Get all occupants out of the vehicle.
  • Check the tires of the vehicle and the trailer.
  • Check the load in the trailer.

    Make sure the load has not shifted.

    Make sure the tongue weight is appropriate, if possible.

  • Check the load in the vehicle.

    Make sure the vehicle is not overloaded after occupants get in.

If you cannot find any problems, the speed at which trailer swaying occurred is beyond the limit of your particular vehicle-trailer combination.

Drive at a lower speed to prevent instability. Remember that swaying of the towing vehicle-trailer increases as speed increases.

Dinghy towing