TOYOTA 2010 Yaris - Manual (Page 187)

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2-5. Driving information
Towing a trailer
Consult your Toyota dealer for further information about additional
requirements such as a towing kits, etc.
■ Trailer tongue load
The trailer cargo load should be distributed so that the tongue
load is 9 to 11% of the total trailer weight, not exceeding the
maximum 70 lb. (32 kg) (Tongue load / Total trailer weight
× 100
= 9 to 11%)
The total 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.
Total trailer weight
Tongue load