In the 'Sat7_VehiclePawn' file
The key value of the weapon setting in <turretIds> of the <roles> item specifies <li>mainCannon</li> and <li>coaxLaserMG</li>.
Those two do not actually exist, and the key values ​​for weapons that actually exist are 'mainGun' and 'CoaxLaserMG'. (I think the absence of CoaxTopMG was intentional.)
Therefore, currently the Sat7 can fire its main weapon even when no occupants are present.

I am using a translator. I apologize if this seems rude.