We just picked up a used 2013 Nissan Titan 50000 miles on the OD. Found out the Tow-haul mode is out or the light is not working. Should I just drive in Drive or drop down and drive in 3rd?? Pulling a 20ft F-S about 3000 lbs.. Only pull about 50 miles round trip each week.. Need to go long term with this truck, Thanks..