Yes, you are right as I use AAI-Vehicles, not serious though as I just managed to make the miner to work after watching instruction-videos. AAI-Vehicles is not a must to have, just fun to learn and fool around with, so I will uninstall it and the main reason is that I use production modules when I mine, which doesn't work with AAI-miner as far as I know. :)
I did a test with the autocanon yesterday and my biters are at lvl 97 and it is extremely effective for sure. I do not need a tank to get the biters down fast but it sure makes it funnier for sure and combined with Alien-loot makes it more funnier to go out for a stroll in the landscape. The goal is to install harder enemies and [Z] latest mod that will make it even funnier to explore.
I hope you get in touch with the author of AAI-Vehicles one day and that it get sorted out and meanwhile I put the AAI-V aside. Thanks for the fast reply. :)
//Pekka