Same here. After I recently downloaded a bunch of trucks the sound on all of my other trucks stopped working. All of the files are un-packed and I changed nothing else. It randomly worked for one truck the other day and hasn't worked again since.
The tail lights are hateful. I hate the side glass in the B pillar. Vettes have never ever had windows in the B pillars. Now everyone who wants a Viper, 370z, and a Ferrari F12 Berlinetta but with ugly tail lights can just buy a Corvette.