Toyota Yaris Owner's Manual page 174

174
4-1. Before driving
Important points regarding trailer loads

Total trailer weight and permissible drawbar load
1
Total trailer weight
Weight of the trailer itself plus
the trailer load should be
within the maximum towing
capacity.
weight is dangerous.
(P. 468)
When towing a trailer, use a
friction coupler or friction sta-
bilizer (sway control device).
2
Permissible drawbar load
Allocate the trailer load so that the drawbar load is greater than
25 kg (55.1 lb.) or 4% of the towing capacity. Do not let the draw-
bar load exceed the indicated weight. (P. 468)
Exceeding this