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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Sorry but I would never use that method front or rear ever.