You might be better off filling the propane tanks, turning on the heat to maybe 75 degrees, and defrosting that way. Hopefully your rig has some heat going into the lower parts of the trailer where the tanks are. You will probably go through a tank every day and a half, but that will be cheaper than repairing the damage to the plumbing, if it hasn't already occurred.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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