Weapon on Vehicle

Does anybody know how to implament this www.codesampler.com/source/trq_weapons.zip onto a vehicle. I've used it on a FPS and really liked it, and want to use it on a vehicle if possible


To make it work in FPS you have to enter it in the player.cs

function PlayerShape::onAdd(%this,%obj)
{
    parent::onAdd( %this, %obj );
    %obj.mountImage( RocketLauncherImage, 0 );
    %obj.setImageAmmo( 0, 1 );
}

I've tried doing the same in the car.cs but to no avail
can someone help me??