How to do this !
First;
/v moonbeam & /hydro & /nos and u can save pos. (forfailings)
then just drive fast with /gravity 0.008
while ur close the bump, u type or paste when u copied, /gravity 0.001
when u going to bump it, press 8 on ur numpad, then when u maked good speed, a nice bump.
u can do this like the video above !
Goodluck & Have fun !
Greetz;
Davey aka. SaNiiX