Page 117 of the game manual gives you a good overview.
AT-13 : AT platoon - SF - Bad quality; AT platoon - Republican Guard - Good quality
AT-7 : AT platoon - Republican Guard - Good quality; I also saw some Good quality BRDM-mounted recon platoon with an AT-7 launcher.
I had the same problem. Since I was playing real-time, the best to do was to unload the most exposed trucks before Mr Kornet come and say hello!
About 10 casualties, even if I tried several times
I was looking for that since I haven't understood all thein-game sentences.
Now I can translate the whole thing in French for my numerous non-english speaking friends