As someone who is well versed in using my RV in below zero temperatures (below zero, as in negative numbers).
Your RV repair guys gave good advice if the temps you will be in are not expected to drop below 25 degrees. Water Softener Salt, or rock salt will lower the freezing point of the water.
However, it is just as easy to mix your standard toilet chemical with a gallon of RV antifreeze. Depending on how long (how many over nights you will be), as you flush with the water, add a cup of RV antifreeze from time to time.
Black tank water heater? Perhaps someone who knows for sure can chime in. However, I believe that will only work when you are on generator or plugged into shore power.
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2018 Jayco Octane 260
2019 Dodge Ram 2500, 6.4 Hemi, 8 spd A/T
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