Hi Ferg,
Had a similar problem about 28 years ago, shipping a Land Rover Station Wagon to Australia for a car rally. We had sponsorship from a container company where we could use an insulated container as they leave UK empty, problem is there is less headroom, what to do, ended up borrowing some 13 inch wheels as used on the Series 2A SAS patrol and put on some old low profile car tyres. That brought the height down, then fitted original wheels once it arrived at destination.