Question When uncoupling a dolly, you should: Answers Unlock the pintle hook before moving the dolly out from under the rear trailer. Move the dolly out from under the rear trailer before unlocking the pintle hook. Raise the dolly landing gear. Remove the dolly as quickly as possible. Explanation Never unlock the pintle hook with the dolly still under the rear trailer. This could cause the dolly tow bar to fly up, possibly causing serious injury. Take a FREE Practice Test Now This questions appears in the following tests: California Double , Mississippi Double ,