Sounds like voice of experience. I'd been wondering how to drain the WH. On full size trailers, often a tall 30 or so water tank, some have a household
40 gal. Drain plug? I'll remember to Rectorseal and teflon the plug, and put it back. Thanks for sharing your wisdom.
Christopher A. Young Learn more about Jesus
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All good suggestions. Here are some other possible things to do.
If the trailer has a fresh water tank and pump, after you drain the tank, run the pump for a little while to clear any water in it.
check for an outside shower hatch and be sure to open it's valves while you blow the lines with compressed air.
Now, before you add any antifreeze, look under the trailer and find the low spot drain plug and remove it and let the remaining water drain. Replace plug or cap.
If there is a shower with a head on a hose, open the head and let the hose and head hang down as so any water trapped there will drain out when you blow out the lines.
Take some pipe compound with you to smear on the threads of the hot water tank drain. Do not leave the plug out, the threads will rust badly over winter. Ask me how I know that.
As written already, now blow out the lines and then add RV antifreeze to fill the traps for the sinks and shower, etc.
Paul