Slab tie down straps

Looking for what works that is simple to secure Slabs (http://www.VerdeUbatuba.com) to A frames we have been using nylon ropes but we lost another slab because he did not put the rope through the A frame.
Been thinking about a 1 inch strap with cam buckle i will need 100 of them i just want to get it right.
what works for you ?

thank you for your input
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Curtis Marburger, SFA
CornerStone (http://g603.net) Granite
Elizabethtown PA

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