I have been lurking and searching the internet and have come up with this. So plans for my wifes Altitude are a set of Yokohama Geolanders in 235/60/18 along with the ATP 2" lift and a set of 15mm wheel spacers all around to clear the spring perch up front. My concern is the tires not being tall enough if that makes sense I don't want it to have the lifted with small tires like that seems to be the fad on diesel trucks these days. I would get some 17's but the wife likes her current wheels and doesn't like the idea of buying a new set of wheels.