The day you have frozen pipes in a RV is a day you will cry.
I’ve seen it all in 22 yrs.
Get some pink stuff and winterize.
Usually the manual has it in the back pages.
The washer is easy. The ice maker is easy.
If you are unsure of your skills, do what I did 20 yrs ago. Pay a tech to teach you how to winterize.
I have a 43 ft with washer, dishwasher, two bathrooms, and ice maker.
It took me about 1 hour to fully winterize.
I keep a cheat sheet next to the dishwasher and the washer just to make sure, since I just got the RV with a dishwasher last year.
Antifreeze is $2.70 a gallon at Walmart
They even ship it
IMPORTANT if you have a Aquahot
DO NOT blow the lines, use antifreeze only.
You can damage the Aquahot.
I think oasis has the same warning
My Horizon uses about 14 gallons total
Here is my cheat sheet.