North Idaho ???? If it's anything like northern Michigan, you need all the protection you can pump into the plumbing on your RV. That means "air to start" followed by "pink to finish".....
Looking "logically" at winterization costs and trailer repair costs, $6 this fall beats $600 in the spring YMMV
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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