Just a heads up, many of Theshanergy's vehicles no longer work correctly in the latest versions of Outerra. Many won't start at all, or simply float in the air, etc.
I wrote to Theshanergy several weeks ago regarding the issue, and he wrote back that he has drifted away from Outerra and would like somebody else to take charge of keeping the vehicles up to date.
Have not heard from him since. But that's the situation as it stands right now if anyone is wondering.