Car Jumping?

good day, my friend owns a junkyard and recently bet me that i could not jump 3 cars with the help of a makeshift ramp in my convertable 83 VW rabbit, I have faith in my car cuz she purrs like a kitten and im sure she could easily clear 4 cars with no problem, this is set to go down this saturday at sunset, please give me some tips on how to prepare!! thanks!