I use one of these 12VDC tankless air compresors which takes time to come up to pressure... This seems to be just right for me...
I hook this up to the city water connection point using one of these air adapters (AMAZON)
Of course my trailer is a small trailer with minimum water lines etc... The BLOW OUT method works great for us as we like to camp late in the cold season. We can drain our fresh water tank, blow out the water lines, and fill the P-TRAPS with some pink stuff pretty quick. Then the next day we can use our water system again by just adding water to the fresh water tank...
Our winters here in Northern Neck Virginia are not all that long term. Usually warms up great during the day time hours...
In my working years I spent alot of time in the North Texas Wichita Falls area and boy when it got cold it was really cold there haha... Road freezing was a hugh problem for us but like you say it usually warmed up pretty quick the next day... Of course when the Blue Norther comes thru its Katie Bar the Door for sure...
Roy Ken
My Posts are IMHO based on my experiences - Words in CAPS does not mean I am shouting
Roy - Carolyn
RETIRED DOAF/DON/DOD/CONTR RADIO TECH (42yrs)
K9PHT (Since 1957) 146.52M
2010 F150, 5.4,3:73 Gears,SCab
2008 Starcraft 14RT EU2000i GEN
2005 Flagstaff 8528RESS