Winterise my Mohican auto trail

[sajad]

Hello everyone/ I need to winterise my 20 year old Mohican,fresh and used water is fine but it’s the boiler/hotwater tank -don’t have a scooby/so any advise is welcomed.
Thanks in advance.
Ps is MH grade antifreeze the way to go or not ?

 

[gus-lopez]

there should be a valve beside the boiler to drain it down.
Anti freeze for what?