TOYOTA 2011 Sienna - Manual (Page 382)

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2-5. Driving information
2
Wh
en drivin
g
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 % of the gross trailer weight.
(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.
The gross trailer weight and tongue load can be measured with plat-
form scales found at a highway weighing station, building supply
company, trucking company, junk yard, etc.
Gross trailer weight
Tongue load
Hitch
Trailer hitch assemblies have different weight capacities established
by the hitch manufacturer. Even though the vehicle may be rated for
towing a higher weight, the operator must never exceed the maxi-
mum weight rating specified for the trailer hitch.