ur placement-script isn't working :(
this should solve the problem :

GS_Gearstand.c
class GS_Gearstand extends Container_Base
{
override void SetActions()
{
super.SetActions();

AddAction(ActionTogglePlaceObject);
AddAction(ActionPlaceObject);
}

override bool CanPutInCargo( EntityAI parent )
{
if( !super.CanPutInCargo(parent) ) {return false;}
return IsInvEmpty();
}

override bool CanPutIntoHands(EntityAI parent)
{
if( !super.CanPutIntoHands(parent) ) {return false;}
return IsInvEmpty();
}

override bool IsDeployable()
{
return true;
}
}

class GS_Hatstand extends Container_Base
{
override void SetActions()
{
super.SetActions();

AddAction(ActionTogglePlaceObject);
AddAction(ActionPlaceObject);
}

override bool CanPutInCargo( EntityAI parent )
{
if( !super.CanPutInCargo(parent) ) {return false;}
return IsInvEmpty();
}

override bool CanPutIntoHands(EntityAI parent)
{
if( !super.CanPutIntoHands(parent) ) {return false;}
return IsInvEmpty();
}

override bool IsDeployable()
{
return true;
}
}