I went from 225 to 245/70's on our stock '05 w/alum wheels with no rubbing issues. Granted I have all season tires, your mud tires may give you very slight rub due to the larger tread lugs, Most 245/70's will fit on stock rims without the need of a lift. You could always do a clevis lift and rear isolator for a small 1/2- 3/4 inch lift if you have rub issues. The 225's will fit fine, but if you can, no reason not to go up a size or two.
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'99 Tahoe, 3" BL, 285/75/16's , MT II's.
'05 Liberty Sport, -wifey's
'98 Poncho Fireturd, 3.8L, .....the purple pig!

