I have a Grey Wolf not a Salem, so couple thoughts. Assuming you don't have a winterize connection on the outside of the TT, then look for a bypass valve on the intake line going into the water pump. Probably close to the screen. If your TT doesn't have one, you'll need to install one.
Good luck.
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Mitch in MN
2018 Patriot (Grey Wolf) 23MK travel trailer
2011 Durango 5.7L and OEM tow package
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