i put 4 fold down D ring anchors in the floor about 2 ft. in front of car and behind the car and use these tie downs from Jegs
http://www.jegs.com/i/JEGS+Performan...80121/10002/-1
I hook the the front to the frame rails and criscrross the tie downs so the car can't move side to side or backward. on the rear i do the same thing except i tie to the rear shock/wheelie bar mount.
Zip.