I wax my zippers.
On hub style popups I will use a monopod such as a triggerstick, placed on my chair to help hold the center hub up in snow.
They will collapse so be aware of that.
I also use a Mr Heater......and can sit in below zero temps rather nicely.
I bought my Double Bull 360s in 2003 and then another in 2004. Both are in fantastic shape.
JW