Lari challenged me to create a massive vehicle that was capable of operating on land and water, and also could be used as forward base.
So here it is, the Crocodile. This massive ship-like structure is kept over 10 giant independent track modules. When it need to operate in water, it's massive 8 turbines inflates enormous hovercraft cushions under the hull, making it not only floatable but also capable of keeping the speed of an average ship of it's size.
The Crocodile can transport land vehicles or small hovercrafts inside it's hull, opening a jaw-like door for them. In the upper part, three separated hangars can keep unmanned drones, attack helicopters and transport/medivac choppers.
As a defensive/transport/base, this vehicle don't have many offensive guns, relying in goalkeeper-like turrets against missiles and rockets, anti-air missiles and two massive naval turrets, made for artillery support to the troops and smaller vehicles it carries.
(Model done in Sketchup 8, rendered in Twilight, additional pictures taken from Wikipedia commons and previous works)