Question When backing a truck, you should: Answers Only use the side mirrors on the driver’s side. Use both side mirrors. Not use a helper. Only use the mirror on the passenger's side. Explanation To remain aware of hazards behind your vehicle when backing, you should frequently check your mirrors on both sides of the vehicle. Have a helper watch your blind spots whenever possible. This questions appears in the following tests: Colorado Tank Delaware Class A Knowledge Test Florida Class A Knowledge Test Illinois Class A Knowledge Test Kansas Passenger Maryland Tank New Jersey Double West Virginia Class A Knowledge Test West Virginia Class B Knowledge Test