My procedure for my Montana
Open drain for fresh water tank and let it start draining
Pour 4 gallons of antifreeze in a bucket
Set the bucket near level of winterize connection to reduce lift for pump
Connect short hose to winterize connection,
Drop other end in bucket,
Bypass and drain water heater,
Turn winterize switch to ON,
Start pump,
Open one low point drain until I see pink then close it,
Open other low point drain until I see pink then close it,
Go inside and open a faucet until I see pink and then close it,
Repeat with all other faucets (kitchen, bath, shower, toilet),
Go outside and so same with outside shower faucets,
Connect outside shower hose to black tank flush connection and run antifreeze thru that line, then disconnect that hose,
Go inside and turn washer to cold setting and run washer until I see pink in window,
Set washer to spin and drain,
Set temp to hot and run washer until I see pink,
Set washer to spin and drain,
Turn winterize switch to NORMAL,
Leave water heater bypassed until spring dewinterizing.
This also puts antifreeze in the P traps during the process.
I don't have ice maker so I leave that to those who do.
4 gallons is typically enough, but being generous with antifreeze I buy 5 gallons.
