This is how to 360 on ski’s with Fall Line Skiing. You should be able to 180 and preferably Switch 180 Before doing this trick.
Run up to the Kicker with a good amount of speed to comfortably clear the knuckle.
As you get to the lip of the Kicker you want to rotate your upper body as you would for a 180 but with a bit more power behind it to give you the extra spin. You should time this so your upper body has started the spin before you pop, your legs will then follow.
You will now be looking back at the kicker but if you keep looking you will spot the landing again just like a switch 180.
To speed the rotation up, tuck up, to slow it down, open up.