I am learning with my first car dolly. One thing I noticed is that although when I load the car it is all the way up to the front bar, at times when I stop and look I can find the tires as much as an inch moved back from the it. The straps are as tight as I can. Is it because I use basket type straps? Is this because the base where the tires stand on the dolly swivel? What am I doing wrong?