I know the Z71's do not have a full-size spare on them. The question I have is...will a full-size spare fit under the truck? I would hate to get a flat and put a donut on it. Bad idea with 4WD, its hard on your transfer case.
Mine has a full size on the alloy rim. Crew Cab Z85, maybe it's different on the Z71's. Even if it is the full size spare would fit fine. I added the 2" hitch after the fact and the spare fits just fine in there.