This trick has many names but I am going to stick with Double grab and truck driver. Anyway I think Truck Driver is a good name because your grabbing your board like steering wheel (Kind of)
This is best done off a big ass ramp or bowl. Go at ripping speeds so you can get really high. Then Ollie up and bend down when your in the air so its almost like your sitting on your board. Grab an Indy with your back hand and grab a method with your front hand. Hold it there then let go and prepare to land. Just bend your knees because with big height it can hurt your legs if you don't land right.
Good Luck!