What makes it even more impressive is that it looks like they're operating at a high density altitude up in the mountains... I'll bet they could really rock it out at sea level....
And probably (but not surely) pretty cold, which would again shorten t/o distance...
I wonder how much cargo, if any, they have in there?
I'm sure a 30kt wind in the face doesn't hurt either. I have a video of a Piper Super Cub doing this stuff.... I don't have my home computer hooked up, so I'll have to post the videos later, but its impressive nonetheless! Who needs a runway when you can use a small parking lot?!?