I have an XL7 which is similar to the GV. I haven't done anything to fit the 29's (225/75R16's) up front. But they do rub, pics in the xl7 forum. At 'melt, I got a lot more rubbing as the whoopi-do's compressed the front more. Not a big deal in my part. For the rear, I've added a 2" Jeep spacer and bump stop riser. No rubbing at all at full compression.
See how big the 235's are (different manu's have different sizes). Measure the current tires on the rim. Use this info to determine if it's necessary.
Lifting the GV won't be easy as they are slightly different than the Trackick. Similar setup but the coil is stiffer, the control arm differently designed, cv's tab bit longer, brakes bigger, strut overall longer length, rack and pinion steering for the front axle. Rear axle has 2 pair of unequal length control arms as well as a track bar.