Roberttheii:

you might be suprized. I found some military shackels that have like 15,000 pound rating that were considerably small.

Just out of curiosity what kind of tow points are you talking about? better question, what kind of care do you drive that will tell you the rating of the atachment points,

Also if the shackels exceed the weight of the car by 2 times then you should be OK, even if they don't match the tow strap.