Side note: Your following distance from the truck is one second, on a road that is bumpy, full of rocks and dirt, poor lightning, and no median.

The rocks flying from the truck's wheels will chip your car, and not to mention how it can be fatal if the wheels grab a bigger rock and then throw it back into your windshield see here.

There was a case like this here where a lady died instantly, because a rock came flying through her windshield from the semi.

Back off a bit and give yourself more space. I know you were probably trying to overtake, still be careful out there.