No it won't. Not even close. Th ground clearance on the Xterra isn't great, but on the WJ it could scarcely be worse. It also comes stock with 2" smaller tires than my 2003 X. The WJ is also on a unibody (car) platform and requires about $1K in reinforcement before you can think about making it an offroad rig. The lack of a frame also means it is possible to dent the structural porttion of the unibody, necessitating more skids. I can drag my Xterra frame across the rocks, while the vitals need protection. With the WJ, you need to protect everything; The unibody simply isn't strong enough for offroad duty.

If had had to choose a grocery getter, I'd take the WJ. For an offroad rig, the Xterra is simply a better platform to start with.