Lexus LX 570 2009 Manual page 297

Trailer tongue load
● A recommended tongue load varies in accordance with the types of
trailers or towing as described below.
● In order to ensure the recommended values shown below, the trailer
must be loaded by referring to the following instructions.
The trailer cargo load should be distributed so that the tongue load is 9
to 11%.
(Tongue load / Gross trailer weight  100 = 9 to 11%)
If the gross trailer weight is over 2000 lbs. (900 kg), it is necessary to
use a sway control device with sufficient capacity.
If the gross trailer weight is over 5000 lbs. (2268 kg), it is necessary
to use a weight distributing hitch with sufficient capacity.
If using a weight distributing hitch when towing, keep your vehicle level
with the ground.
The gross trailer weight and tongue load can be measured with platform
scales found at a highway weighing station, building supply company,
trucking company, junk yard, etc.
2-5. Driving information
Gross trailer weight
Tongue load
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