I have some surplus military cargo straps rated at 5000 Lbs. each that have the closed latch on both ends, I do use axle straps on the car over the rear axle and the tie down loops welded on the front of my S/P cars front rack and pinion mounting bar. I use four of them on my cars, one on each corner
I've had these straps for over 20+ yrs. and they have been used on a bunch of different cars back when I first used a open trailer, then 4 different trucks and 3 different enclosed car trailers since then, they work really great, I try and stop after one hour towing when I'm going to a race more than 200 miles away and retighten the rear straps after they have stretch and settled in. If I don't they will have a little slack, not a bunch, in them when i get to the races more than 100 miles away