I bought a dolly today and I was trying it out... I put the explorer on the dolly and strap the front tires and I tried to move the dolly but it did not wanted to move... so my question is even with the truck on N and 4x4 off does the front tires still spen? I know I need to remove the driveshaft when in tow but I thought 4x4 is only engaged when 4x4 high or low is on?