You will need 2 ramp trucks and either the agency SUV or the buggy and a second player - park the ramp trucks so that they are facing back to back with at least 4 car lengths in-between.
Have one player drive their vehicle up on one of the ramp trucks so that their back tires are just touching the ground - then have the second player get in the other ramp truck (the one with no vehicle on it) and have them back it up into the other ramp truck - this will send all 3 vehicles into the air and the agency vehicle the furthest.
The player in the agency vehicle then can do front flips, back flips or barrel rolls while in the air. MAKE SURE TO LAND ON YOUR TIRES NO MATTER WHERE YOU ARE GOING TO LAND ... even if you land in water land tires first or you won't get the driving skill.
You can do this as many times as you need to build your driving skill up. I have done this with many people to help them and it does work.