Thanks dedmen but I'm still having no luck.
I need steps for dummies I know nothing of this stuff I just a copy and paste.
I have tried
class CUP_B_LR_Transport_GB_W: LandVehicle {
tf_hasLRradio = 1; // 1 = true, 0 = false };
and
class CUP_B_LR_Transport_GB_W: Car_F {
tf_hasLRradio = 1; // 1 = true, 0 = false };
and I get error undefined base class : LandVehicle or Car_F.
I have also tried null = [this, "driver_radio_settings"] call TFAR_fnc_setLrSpeakers; in the vehicle init and not working for speakers. Ideally I'm hoping to find something I can put in the mission init.sqf that will set speakers on for all vehicles but will be happy with any working command.
Thanks.