Cargobob should have a car magnet as seen in the Fleeca job finale, it should be available by default or by research. Press E to stop magnet or drop cars that are
GTA 5 PC - Working Skylift Magnet MOD! (Pick Cars up With Helicopter Magnet) - YouTube
3 Ways to Fly Helicopters in GTA - wikiHow
Download Leviathan with magnet v1.01 for GTA San Andreas