Regarding the Shurflo water inlet prob most of the factory SMB conversion have (mine is 2005 Ford Econ SMBEB50), this one...
"SHURFLO 183-029-14 Pressure Reducing City Water Entry"
Mine developed a crack a couple years back and I replaced it. I figured age did it in but did recall I had recently been skiing and van was parked overnight a few nights in below 20* temps. I was not camping in the van but do leave the furnace on lowest temp to keep the interior items from getting too cold.
Fast forward to this year and the new unit has again developed a leak...no surprise this time as again it failed on the next camping trip after a skiing trip in sub 20* temps, almost exactly as before.
I have searched the forums and it seems the only remedy that might help it live through these conditions is to drain the water system.
Is this still the only suggested prevention? Any suggestion as to making this thing live through sub freezing temps is appreciated.