Bill, just a little more info that I found.
see kw/00
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/24579303/print/true.cfmI took the following off a forum, don't know if the tire size would cause a tranny issue or not . Someone may have had a problem, not sure .
....If you're going to go off-road even a little bit, switch to a tire that can do that for you without spinning all over the place on a wet day. Go to 265s or even up to 285s with a more aggressive tread as long as you go to an 8" rim with the 285s. My Michelin AT M/S 265s work great. Many say the Revos are good too, as well as BF Goodrich All Terrain TAs.
With 285s...
1.you might have to do some trimming on the wheel well liners.
2.Your shift points in the tranny will change.
3.You will probably see a loss in fuel mileage of 1-2 mpg.
4.You need 8" rims. (Stock rims are 6.5")
5.You can't get E-rated tires.
6.You need a programmer or a friendly dealer to reset the speedometer.
7.If you have any tranny problems with 265s or 285s, the dealer can void your warranty for repair.
8.The 285s are taller and wider. Definitely a better look.
There's other differences, but this is geting to be a long answer