Old thread, but I will tell you what worked well for me. Believe it or not the only tie downs I used were two d rings in the floor that allowed me to ratchet down on the rear wheel. The strap ran around the top 2/3 rds. of the tire. With the E brake on it stayed put for a 2800 mile round trip. I did have to adjust tension 2x on each trip. Worked excellent.