Not sure which model Jayco you have but if tank type water heater you need to drain it and replace anode. Once the heater is empty and bypassed I would pump anti-freeze thru all lines and pour some in drains.
I have been in Las Vegas since 1985 but I grew up in MO. and I remember those winters! Even here I use anti-freeze in my coach but we still camp and not use any plumbing.
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2015 Jayco Precept 35UN
Towing JEEP TJ with Roadmaster plates and bar w/Blue Ox Patriot brake
OR
an Aluma low bed trailer with HD Road King and/or Polaris RZR onboard
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