you can prevent your water hose from freezing by trickling one of your inside faucets during the freezing temps, ... when doing that you do need to drain your gray tank and leave it open during the entire time you are trickling a faucet, .... the times we've done this, we used the shower for that purpose, ... using the shower I could get the trickle flow just the way I wanted it and leave it, without having to keep redoing it every time after the sink faucet was used,... we laid the shower head in the floor of the shower and let it trickle the whole time the temps were below freezing, ... once we got thru two nights at 17deg, without any problem, .......
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