I don’t know a J model from a A model. All I know is nothing good ever happens once you are inside! Being a Marine it was typically our transportation of choice as we always got low budget wheels! Many a brawl for sleeping rights on the pallets. Some killer king of the hill brawls. You would just get to sleep and next guy up would ambush you. Just young men burning off adrenaline trying not to be scared to death. Much prefer my pretty little feet to be on the ground. You guys can have all that flying nonsense!