We're in the desert southwest (Southern NV) and it has been in the mid-20's for the past few nights and will be for the next few nights. It has been getting up in the forties and fifties during the day.
Most in our park are not doing a thing. Some have left a trickle of water running during the night (gray tank valve open ...don't do what one guy did and left the valve closed and had water overflowing his shower in the morning
). Unless you have a hard freeze for a substantial number of hours, usually, the hose will not freeze solid enough to expand and split when thawing. Where we are, it only remains below freezing for a few hours ...those hours just before the sun rises. That doesn't usually give the hose enough time to freeze solid to where it will split.
That said, we will disconnect the hose and use the tank water and pump tonight as it is predicted to be around 22 degrees f. to be on the safe side as you're doing.