I would also add antifreeze, don't forget about the outside shower and the toilet flush valve, and pour some antifreeze down each drain. Also drain the water heater ( and bypass it) if you are going to use antifreeze.
Be sure you have a regulator on your air line set to 40-50 psi.
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Steve 2023 Ram 3500 6.7 Cummins (aka towing beast)
2022 Keystone Sprinter 32BH
B&W Companion
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