Hello mate. I thought it was pretty obvious really. Why else would i want to put AT's on it?!
The wheels on there at the moment are very wide. I'd imagine the off road wheels i get next wont be as wide. Which is one reason why i wanted to get the spacers, to keep it the same as it is now or wider if possible.
I put wheel spacers on both my Hilux and my Landcruiser and each of them had no problems for the 2 years i had them on. The Landcruiser needed a new CV joint at one stage but the Hilux didn't need anything done to it for 2 years when i eventually sold it. Both cars were much better off road when traversing over slanted hills and banks. At least in my opinion anyway. (Less chance of rolling)
Different cars are built differently. Which is why i wanted to hear from others with L322's who had already put spacers on their cars.
I don't really know anything about offsets etc, so i guess i will have to buy the new wheels first and then ask again? They will most likely just be smaller Land Rover wheels off another Range Rover is ebay alows it.

The smaller the better i.e 17" with some bulky tyres like BFG's. They have always done me proud in the past. As for on road ride comfort, im not too bothered. Im sure the air suspension on the L322 will be more than adequate to cope with them. It will be what it will be. All i care about is taking this laptop off road to see what she can do!!