I am confused by what has happened? What is wrong with a 5 dollar ratchet strap? They are rated to 500-1000lbs static for a 1" strap pending the brand you get. Mine has been on the roof off and on for 2 years, same strap. No degrading of the nylon, no rusting, no problems. The dynamic fail point is much higher.
http://www.ratchetstraps.com/1-x-10-...t-strap-s-hook