Toyota 4runner 2009 User Manual page 222

2-5. Driving information
Matching trailer ball height to trailer coupler height
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Before towing
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Check that the following conditions are met:
l Ensure that your vehicle's tires are properly inflated. (→P. 479)
Trailer tires should be inflated according to the trailer manufacturer's rec-
l
ommendation.
All trailer lights work to be legal.
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l All lights work each time you connect them.
The trailer ball is set up at the proper height for the coupler on the trailer.
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The vehicle remains level when a loaded or unloaded trailer is hitched.
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Do not drive if the vehicle is not level, and check for improper tongue
load, overloading, worn suspension, or other possible causes.
The trailer cargo is securely loaded.
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l 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.
224
No matter which class of tow hitch
applies, for a safe trailer hookup, the
trailer ball setup on must be the proper
height for the coupler on the trailer.
Coupler
Trailer ball