What that slab? I've driven up that slab with my IFS 4Runner. Wasn't that hard.
It depends on what line you take. If you look at the pic of the XJ the line that I tried was more to the right, nearly straight up and down. My inclometer said it was 40+ degrees. My right tire came way off and for a second my whole front end was in the air. Rockhound has got about 10" more wheelbase on me so he just walked right up it.