Only tip I can give is do not fill van tank full or it can split it if water freezes.
Drain pumps of water, anyone that does not know how, take off connection from tank to pump (make sure you turn tank tap off first), then take off feed to hose and turn on pump for about 10 seconds on full flow job done. do not reconnect when very cold allow water to move freely out of pump if it wants as there will still be water in there or it will find a way out itself, another tip ios leave taps if you have them on hose reels to allow water out or it could pop your hose in a place you cant normally see.
Have fun