I’m writing a sci-fi story with the protagonist being a superhero/ flying brick. He’s the only super in the world and as a result, many governments, NGO’s, cartels (etc.), and powerful individuals desire his “services”. Plus, he is a trillionaire--long story how he got the $. Some of these people are willing to go to any lengths to force him, if necessary, to bend to their will, so to speak. He was transformed from human to superhuman, so has many relatives and close friends who could be used as pawns and/or kidnapped.
So, the super acquires two 6X6 vehicles, with 3-inch cannons that fire explosive rounds. They are street legal, ie, have all the lights, etc. to drive on the street. Why did he like that particular vehicle? The week before he “flew” into Basel, Switzerland for reasons...and was almost immediately arrested by Eurocorps, ostensibly for flying over French territory without a pilot’s license. (: Curious, he went along with this subterfuge and was driven in a convoy to Strasbourg in a MEV and those AVGP Cougars, plus a Panzerjager 90 with a wire guided missile mount rather than guns. To top it off, they employed an AC-119K gunship with a couple of Vulcan 20mm gatling guns circling overhead. He was impressed by the Cougar’s intimidation factor.
He is attempting to limit any overpowered abilities to prevent total disaster. On advice from ex-military acquaintances, he acquires the cars and publicizes that he has them so they will know he has the weapons.
My question is: can he register/license them and travel in them across the US? I’m not familiar with weapon laws; are they different for each state? He’s located in Florida.