You can leave a heater on 40, and water will not freeze. Cabinet doors open will prevent traps from freezing, and drain the low point drains, and the water heater. If the camper is in the sun, and it gets to 50 degrees inside during the day, pipes may never freeze. If you want a little insurance, blow them out with compressed air. Windshield washer antifreeze may be cheaper to pour in the drains, and before anyone gets upset, you aren't going to drink it, and it can't hurt the environment because you are spraying it all over the roadside anyway.
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LadyWindrider
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT
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