I run 235/70/16's and they feel real good under the kj. You should be fine with a 245/70/16 there just a little bit wider than the 235's and a major improvement over the 215's your running, you should have no problems. I've heard some people say they had rubbing w/ the 245/75/16's, but if you do a search on the forums I'm sure you'll find some good info...
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LOST NORTHEAST # 0269332005 KJ SPORT

OME MD lift/ Nitrocharger Shocks/struts
FIRESTONE DESTINATION AT 235/75/16
N.Y. GIANTS FAN!!!!
Go DEVILS!!!