There must be some kind of plastic, hard rubber, or metal shoe that you can buy or make to go on bottom of the legs, kind of like shoeing a horse. You need to keep the wood from coming directly in contact with the ground.
Even if you weather proof the legs once the bottom wears it will soak up the water.
You could probably cut up and old tire tread and make shoes out of that and they would be slip proof. You can get one of those for free as we have to pay to dispose of old tires now.
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