Buy the pipe insulation to go around your hose. Get a heat trace line with a thermostat that plugs into 120 vac. Now take the hose and connect it to your city water inlet. Take the heat trace and from just outside the trailer tape it to the hose every couple feet until you run out of heat trace. Cut the hose there and put on a new hose bib. Now wrap the hose with the pipe insulation and tape every 6 inches. Done.
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