I had tons of problems with smogs driver on my cab. I just uninstalled and installed the new LCD topgun driver and it works like a dream... I am not sure if these drivers work with 2 guns or not, but I will let you know when I try it out. If you are having problems getting your guns to work, try these out, they worked for me.
If anyone has tried this driver with 2 guns, please let me know if it works. It could save me some time!