All terrain tires on stock suspension?

Are you wanting to go with a bigger tire, or just change to an all-terrain tire the stock size? You can put a set of BFG ATs on it in the stock size and it won't change a thing as far as the way it handles and drives, they're good on and off the road. You could also step up to maybe a 31 x 10.5 without any modifications and be just fine, also. The bigger tire size will just cause you ex to work a little harder to pull itself than normal, and your speedometer will be reading lower than your actual speed.

Yeah I didn't want to increase the size, just put them on stock

you'll be fine. If you stay OEM size, the difference will be minimal (except for traction and noise normally associated with an AT tire).

I recommend the Terra Grapplers. They are smooth on the highway and have trail capability.

I went a little bigger than stock, but I really like my Cooper A/T3s. They are quiet and have worked well in everything I've taken them on. Similar tread to the Nittos.

I installed 30" General Grabber AT2 tires on mine. The street ride is excellent, not a lot of sidewall flex, and the grip is pretty good. Off road the grip is amazing. Noise level on the road is very minor. For the price (very affordable) I have been very happy with them.