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In which of the following situations are you most likely to jackknife?

A When your trailer is empty or lightly loaded
Explaination
When your vehicle is lightly loaded, the stiff suspension springs and strong brakes give poor traction. This makes it more likely that the wheels will lock and the trailer will swing out.
B When you are driving on soft gravel
C When your trailer is fully loaded
D When you are driving in especially windy conditions