By Alex Lauer What’s the most fun you can have on three wheels? In the U.S., you might immediately think about the Slingshot, the hellion from Polaris that looks like it’s about to hit the podracing track on Tatooine. But if you prefer old-school sensibilities when it comes to vehicular merrymaking, the Brits at Morgan Motor Company have a new three-wheeler for you: the Super 3. Unveiled on Thursday, the Super 3 is an update of the Morgan 3 Wheeler, which was introduced in 2011 and discontinued last year. There are a number of significant upgrades to this new model: it’s the company’s first ve…