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
Working Skylift Magnet [GTALua] - GTA5-Mods.com
Magnet for helicopter for GTA San Andreas
GTA San Andreas New Heli Magnet Mod - GTAinside.com
Helicopters - GTA 5 Guide - IGN
GTA online guides - Skylift review - YouTube
HVY Skylift | GTA 5 Online Vehicle Stats, Price, How To Get
HVY Skylift GTA 5 - screenshots, features and description of the helicopter