Looking at the sorts of vehicles the Jade Falcons produce themselves or purchase from the Sea Foxes and their roles. It seems like, except for possibly the Horde Clusters, vehicles are used primarily in combat support roles to free up Mechs for direct combat.
Nacons, Kites, and Balacs are used for scouting and spotting.
Oros and Pikes are used for AA defense.
Indras, APCs, Cardinals, and Kus are used for infantry transport and support.
Hadurs, Indras, Gurzils, Huitzilopochtlis, SM2s, and Snipers are used for artillery and fire support.
Skandas, Chalchiutotolins, Sokars, and Demolishers are used for garrison duty and urban warfare.
Also, VTOLs seem fairly common with Donars, Skadis, Hawk Moths, and Cardinals all in use.