Have you asked ICON? They've got a quality first, money-is-no-object type of mindset, which I'm sure you're familiar with.
Also, aren't those based off of landcruiser fj40's and 45's? I'd start researching in the landcruiser section to see what solutions they've come up with.
There's a couple that have travelled around the world in a very, very nice vintage troopcarrier. They've had a lot of custom work done by some very inventive craftsmen in south america that rivals ICON stuff in level of creativity...
"For He so loved the world, that He sent His only son..."
1992 XJ:"Daddy's Jeep" - The "Please don't hit my Jeep again!" Edition.
2009 Ford Edge:"Penny"- "Mama's new ride, and our new trip car"