The problem with that is you end up with something large enough that its no longer just a flying hovercraft, and is now simply a flying boat.
WIG craft cant fly very high at all, so the added maneuverability over a regular hovercraft (of which the marines DO have militarized versions) with a large enough cushion simply isnt much.
What WIG is best used for is heavier lift than from an aircraft, while not being as slow as a boat. The problem is that aircraft aren't very good at the stopping-in-short distances part that military landing craft are good at.
WIG craft cant fly very high at all, so the added maneuverability over a regular hovercraft (of which the marines DO have militarized versions) with a large enough cushion simply isnt much.
What WIG is best used for is heavier lift than from an aircraft, while not being as slow as a boat. The problem is that aircraft aren't very good at the stopping-in-short distances part that military landing craft are good at.