Just finished up OME HD struts, shocks and springs with Hankooks 265/70-17 AMT's. It's tight, but they fit w/out spacers on the stock wheels. Did the pinch-weld mod and it works well. What they don't tell you is that on the Commander you have to deal with the rear a/c lines on the right side so you don't have as much room as you do on the Grand Cherokee. Spare fits sort of) after trimming hitch and bolts, and letting the air out of the tire or "airing down" (who came up with that term). Driving around with a flat spare seems wrong to me on so many levels but I carry a small compressor.
Looks like I think a Commander should