Originally Posted by PeterThePlumber
+1 on this! You say the shut off is below ground, so I'm guessing your in cold climate area. Maybe invest in some sort of heat tape/hose jacket combo it you want to stay hooked up. Or fill the onboard tanks; run off those; and disconnect the hose during cold weather.
Where ever the faucet fitting that you hook your hose to, be sure that your shut off comes first, your pressure regulator comes second and then your hose. There is no good reason to leave the higher pressure on that hose in hot or cold weather
When camping I ride my bicycle through the park and on a hot day you can see the hoses swell from the pressure when they put their regulator up at the trailer end of the hose. One fine spring day at Oceano Campground, Pismo Beach, CA I watched one burst with the camper sitting right in front of it, not realizing it was even a problem until it started spraying his camp.
And NEVER, NEVER leave the water pump on or the city line pressure on to your RV when you are away. A ruptured line, and separated fitting or even a bad dripping leak can RUIN the whole RV if you are not there to stop the problem when it starts. Same with the fire hazard of the water heater, no matter how slight the risk. Turn it off when you are not using it and for sure when you are not there.