All my NumPad
0 key opens / closes the vehicle list. This shows the vehicles in the order in which you will jump using the Tab key, incl. The attached tools / Treiler / etc.
2 & 8 keys move the marker (green) through the list.
5 key selects a vehicle for shifting – the mark changes to red. Press again to exit slide mode.
Enter button goes directly to the selected vehicle.
If you sit yourself in a vehicle, this is written in the list of fat.
I could not test because I do not have time for multiplayer games due to time constraints – so I do not know exactly how the LS handles the hopping sequence in multiplayer games. Officially, the mod is not MP-fit for this reason!