We don't recommend going with anything larger than a p235 with a 2" shackle. Some guys would probably try to jam in a 30", but it will rub when you go offroad and most likely when you hit large dips in the road. Then you'd end up shreading your new tires. Not something most guys would choose to do.
We do have a 3.5" lifted shackle which could probably handle 30" tires. Don't sell too many of those though. Most folks stick with the more easily manageable 2" shackle.