As you can see I just have discovered a new method.This is my post on www.gtastunting.net and they
say it's new.
How to do it:
1.Spawn a Dumper.
2.Drive it on the incoming cars hood but be careful that the car bellow you don't get moved by you
(it can move by itself) or you will fail.
3.Move the Dumper.
4.Enter the "charged" car.
5.You'll be spinning in the air like 10000 degrees and more.
6.Land a building on this way and you got yourself a stunt.