Agree! As long as the OD engages at some point you are good to go-no damage.

This morning outside temp was 25 degrees. Warmed the car for 5 minutes, drove out of the neighborhood and OD engaged within 1 mile of driving at 45-50 MPH-that is with (2) 18,000 GVW coolers. This Winter will be my 5th winter driving with my setup.