Securement to trailer

So this is the configuration I have currently. Seems ok but kinda crushes the tire when tightened. How loose can they be? Perhaps 1 or 2 clicks before tire deformation? Should I really spend the $ to get axle straps to tie down at the suspension? Not meaning to sound dumb but crawling around under the car to hook up doesn't sound like much fun.

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That's pretty much exactly the way the driver tied my road runner down to the roll back when I moved it to the restoration shop. It was on all four tires though. I kind of remember that he unhooked the winch after it was tied down.

It had no engine, trans, or emergency brake but it made the trip just fine and will come home the same way after it's painted.