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If you are using a "stinky slinky" you can freeze the hose unless the angle is quite severe. The water will catch in the ribbing and freeze and then every time you run water over it some additional water will freeze. If you have freezing weather long enough and the angle is very slight you can freeze up the hose. Many people in cold weather only use the valve on the black water tank and let the other tanks drain continually. This will make it more likely to freeze and faster because the water flow will be slight and slow and easier to freeze. Will take a while though. The best way to deal with it is to unhook it and put a new one on. Then you can work on thawing out the old drain hose. Hot water will freeze quicker than cold water so if you try just putting cold water down the drain, it will cool and freeze before you can thaw out a 10 foot section of solid frozen sewer hose. Take the old hose, prop it up at an angle and begin using your wife's hair dryer on it and thaw it out.
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