Tramps definitely help most pro skiers like Bobby Brown, Russ Henshaw, Gus Kenworthy,etc. usually work on tricks on the tramps before they take it to snow.
/static/images/flash_video_placeholder.png
just jumping, flipping, and spinning on a tramp will help out for sure. I think it helps a lot more if you really try to imagine you're taking off of a jump every time you throw a trick. think about jumping off the outside edges of your feet..........anything like that which will relate to skiing.