Hi Jason:
Its not necessary to remove all the water from the main line. We do it up in Frozen Country like this.
Leave it open, cover off the main lines you have removed from the pump end, pour in about two gallons of Anti Freeze, and raise the closed lines above the level of the water. Ice will only cause a problem if it doesnt have a way to grow. By leaving this line open, the expanding water simply moves up the line. The only reason I know this, is I was baffled at my PB closing my pool this way, I was sure they would have to remove all water from this lines but they insist you dont have to with no worry about damage from ice.
Triple, I leave my pool competely open, and I also refill the pool up to over the returns, my reasoning is the pressure of the water an ice will keep everything as it was with water in it. I do not cover, its easier to remove stuff then having to fight off all the gunk in the spring that will be on your pool cover. Other then leaving the filter (Again with Anti Freeze) I bring everything else in, and I suggest you do the same as well.
Hope this helps, and Jason PLEASE correct me if I am wrong.
Rik