According to the FAQ above, you can run 30" x 9.5" with little to no trimming on stock suspension. I can't remember if the Orvis came with Upcountry springs or not, but if it did, you should be able to run a bit bigger than the 30x9.5.
1995 ZJ 5.2L V8 318. 230,000 miles and still rollin.
List of parts not replaced yet: