I'm glad you found the forum regarding support dogs! As I read down the list of threads I see there is a ton of info that describes what you are asking!
I encourage you to read some of those posts and you'll get some good ideas on how you can go about handling your situation with legal rights, etc.

I hope it works out for you to take your dog with you! I'm sure there will be certain legal 'red tape' you'll have to clear with whomever would oversee your situation, but I bet it IS possible. It's just a matter of finding the right people to inquire with and get the 'back up' you need!
Hopefully you'll get responses to your thread!

Good Luck and Best Wishes on your Travels!
Rae