(I'm just gonna put this here so it doesn't look like I'm spamming.)
I might've figured out which mods... Probably, "Small Time Resonders," "Filibuster Rhymes," and maybe "RV Interiors." If you want you can test out those two mods and see if those cause any problems, but for safe measures try to see if "Aquatsar Yacht Club" causes any crashes too... Just in case along with "Autotsar Motorclub." "Autotsar Trailers," and "Autotsar Tuning Atelier." Those are the only vehicle mods I know.

"Better Helicopter (and patch, (probably)" "Expanded Helicopter Events," and "Black Hawk."