Upgraded Stromberg, with a dolphin attached. Drive around on dry land or hold H to go into submarine mode allowing you to go under water with the dolphin! I recommend that you make yourself invisible if you are driving the main vehicle. This also comes with another version where another player may sit on the back of the Dolphins back while the other player drives! This worked flawlessly for me with a XML friendly menu online/offline and hope it does for you to! If you run into any issues with this vehicle, see my profile for tips. You can fly with this to if your mod menu has an option like Vehicle Fly Mode.

. XML vehicle file
Place this XML file in your menyooStuff - Vehicle folder or place this in your mod menus XML vehicle folder.