I've never worried about temps in that range but I'm always in the trailer when we encounter something like that. It doesn't look like it's what I would call a really hard freeze.
I would open the low point drains, crack the faucets 1/2 way open, make sure the FW tank is empty (I believe you said it was), run the pump to make sure there is no water in it and you could drain the HW heater. No colder than it shows I doubt the HW tank would freeze but doesn't hurt to play it safe, especially if you're not on site with it.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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