I'm sorry, but as an off-roader I just don't get this at all.
I don't see how that thing would get out of the parking lot without blowing out the diffs, axles, etc. Does anyone have any idea what the rotational forces are on the drive train when 40 inch tires are turning, or how much torque it takes to move them?
And then there's the issue of what such skinny sidewalls would do when you air those tires down to around 12-15 lbs. which is necessary to work properly off-road?
Sorry to be a doubting Thomas, but to develop this topic some others and I have a couple posts here:
http://www.titantalk.com/forums/showthread.php?t=22706&page=1&pp=15
Each to his own, but to me this is a very expensive toy with no practical use.