A sub that can be balanced using the ballast (ore) To transfer Ballast (ore) Alt click on the ore containers in the front side and the front center and on the front center, click in or out.
Top Speed is 17-18 m/s or about 30 mph. It will reach the island if you are smart with fuel and not turning too much, but you will be living off of dregs. Has wheels but to get off of the runway, just go to the side at a shallow angle so you don't scrape the bottom. Either that or use VesselMover (MOD)