If you run your front straps all the way to the back you can tie down the car entirely from the rear.

I know, you are going to say that will allow the car to move around.

After 2 different trailers and over 160,000+ miles of towing the cars have never moved. Longest tow, 1350, with 550 a regular for me 3 times a year. Throw in another 3 350 milers and you can see those are some good distances. My first trailer was a 19 ft unit and it necessitated the rear tie down. But, works so good I will never do other wise.

Good luck.