Personally, I would avoid Coopers like the plague. I was following a thread on a Mitsubishi Forum about 6mths ago on them as I was considering them. There was a link to a warranty information page on the coopers website that was also copied and pasted from the copy he was given. The warranty info form was available from the public side of the site.
Anyhow, this guy tried to claim a warranty and was knocked back and was shown the warranty conditions which included "damage sustained during off road use not warrantable". This was listed in the doc he was given, and sometime after their website warranty info form was changed to remove this and become more ambiguous.
I called into 2 dealers and tried to get info on their warranty comditions as well as calling coopers dist. Coopers said that each claim was taken on an individual basis and dealers were required to submit claims before replacements and pro rata costings could be offered. When asked about use covered/not covered by warranty they referred me to the website (which is about as useful as a diet crouton). The dealers were just as bad, one said to call coopers, the other at least said that they had to refer all claims to coopers (and obviously you may be without an operational vehicle because of this) and that off road use was covered but was dependent on the type and location of the damage on the tyre.
That, also that there is about 50/50 for & against in general comments about coopers, plus the fact that we can get the bridgestones for US$136-ea instead of $250 and up) make me very nervous about them, plus I just don't find their patterns as appealing as a lot of others.
As I said the testimonials on the BS site read well, I also called one of the tour operators they list in there as a user. I know these can be grain of salt but there just isn't the negatives out there about the bridgestones.
As a size comparison:
Std Available in D694
245/70/17 265/65/17LT
Sidewall Height 6.75" 6.78"Circumference 2433.5mm 2438.4mm
Diameter Difference 0.2% less
Speedo Difference 0.191% slow
So a bit higher sidewall (more protection) with bugger all difference in speedo

