You do not need V-tail because you do not need one stick control to run a tank. A tank is runned more realisticly with 2 stick control like the real thing. Just connect one stick to each channel. You might like to adjust the sticks to point same direction either switching them on your ( expensive) transmitter or physical tailor- rotate the stick anchor on your cheap transmitter . Or if you are not up to conversions, just get used to controlling the tank with 90 degrees' different hand directions. However, you need an extra channel if you want a rotating turret.