I don't trust that single strap setup but I am usually hauling drag cars with skinny front runner tires.  I just had a buddy hauling a car on a dolly that had a single strap come off on one side.  I have straps that form a basket that go on each side of the tire with a strap over the top of the tire to tie it together.  It is adjustable for tire size.  Never have had it come loose.
		 
		
		
		
			
		
		
		
		
		
		
		
		
	
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