Hi Mark,
No I didn't look at much in the 18" since I think they are just too large. But I was not aware of Coopers in 18" anyway, are they new? Apart from the legalities I think they will rub where the rear air conditioning is. If I could find someone who would put them on for me and let me try them it would be great.:D Don't like my chances of that though.
Mickey Thompson MTZ in 265/70/17 sounds great and should be ok for clearance. I don't like the thought of running steel wheels though. There are some requirements for it to look good when not 4wding. Might have to look at Performance alloy wheels.
Tim.

