Have you looked in the library section?
There are several articles there on winterizing.
Seems there are daily posts asking this question this time of year.
As mentioned, a search will bring up plenty of reading.
If you don't get the specific info needed, come back and ask.
Post your make and model of your unit... it will help give more specific answers for your type of rig.
2016 Flagstaff 8529IKBS Diamond Package 5th Wheel-Goodyear Endurance Tires
2017 Ford F-Series SCREW 4x4 - Factory Puck B&W Companion
TST Tire Monitor w/Repeater - Sinemate 3500w Gen.
Days Camped: '17=30 ☼ '18=51 ☼ '19=58 ☼ '20=41