For the love of God, do not fill the water heater with anti-freeze.
Drain and bypass.
Complete waste of money, and how the blazes are you going to get it out of there in the spring?
Every drop of that horrid pink crap has to be flushed out, or you get to experience it all summer...
Spending some time adding the valves and modifying the lines to get gravity to do most/all of the job.
Full timers/Snowbirds/Southern coach owners:
If that deep freeze comes south, or, if catastrophic failure forces abandoning the coach...
What's your PLAN to save the plumbing, as the temp goes away?
Posting a squeaky plea on Social media or the Boards with numbing fingers?
Busnuts and Boyscouts: be prepared?
happy coaching!
buswarrior