Nobody can make any guarantees, even someone with exactly the same trailer. Imagine if yours has a cold water line just 1" closer to the sidewall than theirs.... If your water line touches the sidewall, theirs doesn't, the potential for damage is far greater in your trailer. Conversely, something as simple as using the same heater, you leave your cupboard doors open, they don't... They have a greater possibility for freezing under the sink....
So, it's pretty much an individual thing. Usually, unless you're going to have a "hard freeze" (below about 20F for more than an hour or so) you should be OK with just some internal heat at night. Remember, during the day, the trailer will absorb heat from the sun and that will carry it "above the danger zone" for much of the night. It's only after the structure gets below 32F that you have to worry about things inside the trailer.
Now, as for the exposed tanks under the trailer.... I'd suggest you make sure they are completely empty. Remember the 3" and the 1.5" black plastic plumbing runs to the valves. They are probably more subject to freeze damage (along with the valves) than the tanks, assuming the tanks are empty.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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