You should not use the trailer hand brake to straighten out a jackknifing trailer, because
a) The brake handle is too hard to reach
b) The brakes on the trailer wheels caused the skid in the first place
c) The brakes on the trailer wheels will not respond to the hand brake
Answer: b) The brakes on the trailer wheels caused the skid in the first place
If the answers is incorrect or not given, you can answer the above question in the comment box. If the answers is incorrect or not given, you can answer the above question in the comment box.