From what I've been told if you want 35's on a 3.5", you're looking at a good big of trimming. I'd stick with like 295/70r18, which comes out to 34.3 inches, and that'd probably be a tight fit with possible major trimming. Don't know what tire size your running, so I'll stay basing it off of 18" rim and suggest you get like 285/70r18 (33.7") or 305/65r18 (33.6") since I don't believe you'll be able to go any bigger unless you put maybe the 5" RC lift on it. And like Drew said, x10 is probably as wide as you're gonna wanna go for rims, anymore and you'll be rubbing like hell.