IIRC the trust stays the same. You apply for a change of address with the atf
http://www.guntrustlawyer.com/2011/0...-gun-trus.html
Generally moving from one state to another will not require any changes to the trust with the exception of the state of Maine (only if you want to make additional Title II purchases). A validly created Trust in one state, is valid in another state if you move. Depending on the language in the trust, the rules that it references may change or not. Generally our trusts will still reference the original state's laws once you move. This can be changed if you desire but is typically not necessary.