has anyone ever heard of storing your Bonsai in a cooler through winter with a little water in the bottom of cooler.in the garrage in Ohio. I did it once
and had good resalts with cheeper tree. but I'm a little afried to try with a bigger tree, Please advise

I have heard of people doing it. {Personally, I would grow species that can overwinter without extreme measures, but that is easier for me to say, probably).