Think of a Trust as a person that can't make his own decisions, but is of age to own property. The Trust, that we refer to as a person for this example, doesn't die. He just holds onto the stuff until your son is old enough to legally own it. But in the mean time if you were to die, your wife can maintain control of your guns, cars, and rental properties held by the Trust, on behalf of your son, until he is of age.
You can list your wife as a Trustee, or beneficiary (who the property is designated for.)
You've heard the term "Trust fund baby." This is the teenage punk that's driving fancy cars and doing dumb things with money. The punk's parents put the money in a Trust, because in the event of their death, they want someone to maintain control of the money, until their teenage punk is old enough. The Trustees designated by the parents have no claim on the $100 million dollars they left. They are just someone the parents trust to watch after the money until the kid is old enough.