But honestly, 250 meters to flat would kill you, even with all that speed. Those guys are nuts.
It seems to me that you could make a jump slope like that for newschool tricks and all. You would have to give the jump a more concave-ish kinda landing, so you basically just cruise over flat and the slope by no more than like 15 feet. Sorta like the Gap Session jump. The only issue would be overshooting, cause it would be like hitting a wall if you just overshot the landing and impacted on the flat, like the guy in the vid did.