I'm a bit nervous about the transition. When we move out of the house (but are still legally married), I want to maintain the 50/50 custody that we have now. Mrs. T is going to try to use the change to have the kids move in with her and establish custody for herself -- which I would not accept.
Why does she think she can do this? Afterall you both are changing where you will be living, not just you. Does she have a valid reason why the 50/50 custody can't continue once you sell the home? If you are moving to a new place that can accomodate your kids as well, then I don't see why the previous arrangement would not stay the same.