Get inventory of a hopper minecart and drop it

I am trying to write a simple plugin/add-on for lockette that protects locked chest from Hopper Minecarts.

How the plugin should work:
Deny placing of hopper minecarts on rail under locked chests: WORKING
Remove the hopper minecart if it drives under a locked chest: WORKING

But now a have a problem. The inventory of the hopper minecart should be dropped when it gets removed but i have no idea how this is working.

Code:java

    @EventHandler(priority = EventPriority.LOW, ignoreCancelled = true)
    public void onVehicleMove(final VehicleMoveEvent event){
        if(event.getVehicle().getType() == EntityType.MINECART_HOPPER)
                {
                    final Block ref=event.getTo().getBlock().getRelative(BlockFace.UP);
                        if (!shouldCheck(ref));
            if (Lockette.isProtected(ref))
                    {
                        getLogger().log(Level.INFO,"Block:"+event.getTo().getBlock().getRelative(BlockFace.UP).getType());
                        event.getVehicle().remove();
                        ItemStack drop = new ItemStack(Material.HOPPER_MINECART, 1);
                        World world = event.getVehicle().getWorld();
                        world.dropItem(event.getTo(), drop);
                        // Drop also the Inventory of the Hopper Minecart
                    } 
                }
 
    }