This truck's got two things going for it. A) It's massive. B) It's a Diesel.
This video is a little old, (it was originally uploaded in 2010, so forgive me if its been posted before) but it's still a good one. He gets additional cool points for not having any of the crap in his bed fall out. Check it out.
I agree with powelligator. Didn't accomplish anything except showing off some scary bootyfab and a weak right foot. A little wheel speed, and he might have got that hack job over the lip or it could have just spit those blocks out from under the springs.
This truck has a very long wheelbase making it much less of a challenge. A Jeep with a short wheelbase would struggle for sure. Traction,height,lockers and wheelbase make this very doable and not really too unrealistic. I know I could do the same hill without too much forward momentum as well..fullsizes have their advantages in certain situations for sure but try to stuff them in a tight low overhead trail.
With any amount of forward momentum he should have easily crested the hill and went over, even if it meant rubbing his belly as he passed over. A much shorter wheelbase Jeep would have had more trouble on the same hill. But in the case of this video, the driver's problem was that he violated one of the cardinal rules of Four Wheeling - "You can't crawl sand".