First, forget the fixed length straps. You will never have the car perfectly centered so one will always be the wrong tension.
Mike's rules and techniques for car strapping:
1. Use real car straps, not the junk from Home Depot. Shop at Racer Wholesale or Pegasus
2. Make sure straps have closed-end "C" clamps not the bent-hook design
3. Keep at least one pair of ratchet straps with the built-in axle strap like this. Even if you don't use the axle strap regularly, eventually you will tow something without a good eye hook
4. Try to use at least one pair straight and one pair crossed
5. Use 6 straps if possible. Have several lengths available.
6. Try to use the straight straps in the rear for braking/crash worthiness
7. E-brake on, tranny in neutral
8. Double check the tension at the first stop.
9. Lube the mechanism with TriFlow when it gets sticky, usually 2x per year or more if towing in the rain a lot.
10. Inspect the straps occasionally and toss anything that's fraying in a section where it's under load.
I have never, ever, ever had a strap come loose, nor have I ever had any issue or problem on the road. When I'm towing I am quite confident about the car on the trailer. Peace of mind means a lot to me!
One rule I'm going to add soon is -- find some "reusable" zipties - the kind with the little tab that you can press to undo the zip, like found on some car electrical harnesses. Use these to bundle up loose/extra straps.
_________________
Mike Whitney
whit32@gmail.com, 919-454-5445
V10, V8, V8t, I6, I6, V6, F4t, I4, I4, I4, I4, I2, 1, 1