In a large bowl whisk together the milk, condensed milk, and instant pudding mix. Place in the fridge for 5 minutes or until the pudding is set up. In a stand mixer add 3 cups of heavy cream, 1 tsp of vanilla and 2 Tbsp of sugar. Beat on medium speed until stiff peaks are formed. Fold the whipped cream into the pudding and set aside. In a trifle or 9x13 serving dish, add a layer of Nilla wafers on the bottom followed by 1/4 of the pudding filling then a layer of banana. Repeat the process until all of the filling is gone. Top with some whipped cream by beating 1 cup of heavy cream, 1/2 tsp of vanilla, and 1 tbsp of sugar in the stand mixer then crumble some Nilla wafers on top. Refrigerate up to 2-3 hours before serving. Enjoy!