To this i'd like to add a couple of items. First only those on the trust may have any access to where they are stored, i.e. gunsafe, etc. for instance if your wife is not on the trust she cannot have access to the safe. Also those on the trust must be legally able to own a weapon.
It's a good idea to go through someone like Gun Trust Lawyer as the trust is reviewed by an affiliated lawyer in your state to make sure it conforms to state laws. Costs, but it's worth it as the BATFE accepts the trust but makes no ruling as to it's legality for your particular state.