It looks authentic. The trick in mid-air sort of rules out a dummy. He must have had the van full of padding or hay. I wonder if his boss is going to be PO'ed that this guy used what looks like a company van for the stunt.
The van is cut in. Look at the last frame before head disapears. His head is still above van roof. My guess is that you would have seen helmet fragments and perhaps forehead goop spray.
Plus he does not appear to be preparing for a landing in a van.
If it is fake it is a very good fake. The videographer covers the concept of the rider’s head being sheared off because the angle at which it is filmed supports that the rider does clear the van door.
The suspicious part is actually the dust cloud. At first, I thought that the rear tire strikes the dirt just under the rear bumper but after watching closely, the cloud is emitted upon impact presumably from inside the van and unnaturally dissipates and clears away to nothing within a split second.
Also there is the issue of the van being parked on what looks to be a gravel road. We are to believe that this road ends on a clay mound separated by a chasm between the ramp and the road.
More than likely the jump was filmed first. Then a film was made of the rider driving into a van. Then they edited the second part my tilting the video so it appears that the van is parked on the slope when actually it was level. The dust cloud is either added for effect or to cover some glaring error.
) if this stunt is real, then i think kranich is right! (i hope 
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