If a trailer begins to jackknife, the driver:

Question

If a trailer begins to jackknife, you should release the brakes and allow the trailer wheels to regain traction with the road. Do not apply the trailer hand brake to attempt to straighten out the rig because the application of brakes is what caused the wheels to lock in the first place.

Accepted Answer

Should not apply the trailer hand brake.

Answer

Should firmly apply the brakes.

Answer

Can straighten the trailer with the parking brake.