I have a 20' enclosed CargoMate car hauler trailer. For the front I use a 2.5" tie down that runs over the top of the tire and attaches with 3 D rings. One behind the tire, one in front of the tire and one about 2 feet infront of the front fascia. For the rear I use 4 2.5" tie down straps and 4 12" axle straps that go through the holes in the lower control arms. I have 4 D rings that 2 of the axle straps pull straight back to 2 of the D rings and 2 cross and make an X to the inside D rings. Works GREAT! I have pulled my Z over 3000 miles with no problems...