I rotated mine as anthonyp suggested, that's how my dad always told me to do it... Same tires. Problem is, I waited for about two years to do so, and as I have not had an alignment done in forever, the former front ones were a lot more worn down than the backs... So now, when it's wet, I peel out and fishtail like crazy, but I have incredible steering control, go figure... I believe the rule of thumb is to rotate either once a year, or every 10,000 miles, something like that...
And the BEST way to rotate them is to go to Belle Tire and pony up the $15.00 for them to do it in like 5 minutes, rather than having to deal with the jackstands and all that foolishness... It's hard work to get an XJ to stand off of it's wheels when you're shoulder is jacked up, let me tell ya :lol: