Welcome Aboard!
I do not have any first hand experience with tank heaters. I do not have any. We do camp in the spring and fall when it gets down into the 20's over night with daytime highs usually above 40. So far we have not had any issues.
If your at home between trips, I would strongly recommend fully draining your system, and not worry about using the tank heaters at home. They say you need to have fluid in the tanks to use the heating pads.
What I would worry about is where are your FW piping is located. Most MHs they are under the floor fully exposed to the elements. They will freeze long before the tanks will.
Someone recently posted how they ran heat trace along the pipes, and insulated with pipe insulation. Then installed a controller that will cycle the heat trace on/off to provide just enough heat to keep things from freezing.
Between trips it would be wise to protect the plumbing system. Add some RV antifreeze at minimum down the drains to protect the p-traps. Ideally do that to your FW system too. But many people only use compressed air to displace the water in the plumbing system. The tanks are very large, so a small amount of residual frozen water does not have the strength to break a tank. Also keep an eye on your water heater (if turned off) and outside shower connections, they tend to freeze first.
Good luck post some pictures of your adventures.
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