To answer your questions, a trust can be designed to be moved, but Quicken is not designed for such (in many instances, as I have recounted before, Quicken doesn't even make a valid trust in your home state). However, prior to moving, you have to ensure that your trust will be valid in the new state and then make a determination, assuming your trust is properly drafted, as to which state's laws you want to control (AKA former or current state). Also, regarding your question about changing the trust, as long as it is a revocable trust, you can amend it at any time. HOWEVER, if the trust isn't valid from the start and you place NFA items into it, you risk forfeiture of the items, as well as, unlawful transfer of a NFA firearm, because you have transferred it to a non-entity.