OK, so I just discovered the iBSM for VC too, so now you can hate it in both SA and VC...
Break the 2 car rule first, find a packer that WILL DISAPPEAR and place it where you want the bump. Then jump on the never-disappearing PCJ. Go to the outfit-icon on either the human condo or outside the downtown pizza place and do the flintstone trick. Then drive to the packer and start doing the superspin trick Nitzkit shows on youtube (
www.youtube.com/Nitzkit , search for it). Sometimes instead of going into a huge spin the PCJ stucks into the ground, that's when you should hit the punch-button to get out of the flintstone mode so you can jump of the PCJ. You will fall away from the ground and down (lol) to the sky. When you land on ground again, jump into a vehicle and drive away so the packer disappears. Voila! You've got a VC-iBSM.
Oh, forgot to mention, just as in SA you should wheelie when under the packer
