I am generally using Cinematic Studio Strings, AudioBro Modern Scoring Strings, Audio Imperia Dolce, JXL Brass, Cinebrass Pro, Audio Imperia Jaeger, Damage 2, Keepforest Ferrum, Keepforest Devastators, Audio Imperia Photosynthesis, Serum, Diva, Zebra HZ aswell as various other sample libraries depending on the type of trailer track I am writing.