I can't help with specifics related to your trailer, but here's what I do...
Black and gray water drained at the end of the last trip.
Drain the fresh water tank using the drain valve.
Turn on the water pump briefly to clear water out of it.
Drain the water lines using the low point drain valves.
Drain the water heater by removing the drain plug.
Flush crud out of the water heater.
Reinstall the water heater drain plug.
Start applying ~60psi air pressure through the city water inlet.
Close the fresh water tank drain.
Close the low point drain valves.
Open each faucet (sink & shower), hot and cold side, to get rid of that water.
Close each faucet when done with it.
Open the outside shower to remove water in the faucet and hose.
Close the outside shower faucet.
Remove the air pressure.
Remove the water heater drain plug.
Pour ~1qt RV antifreeze into each drain (sink & shower).
I don't put RV antifreeze in the water lines so I don't change the water heater bypass valves.
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Sherm & Terry w/rescue Eydie (min Schnauzer) & Charley (std Poodle)
SOLD:2015 Jay Flight 27RLS, GY Endurance (E), Days: 102 '15, 90 '16, 80 '17, 161 '18, 365+ '20
SOLD: 2006 Ford F350 PSD, 4WD, CC, LB, SRW, Camper pkg., 375,000mi
Full timing: Some will think you're crazy, some will be envious, just enjoy the freedom!
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