Easy LMG Penetration Kills (Shipment)

Not the hardest challenge but I found it a little annoying sometimes, so thought I'd share this for anyone unaware.

If you shot through the window of the trucks on Shipment(or any map I suppose) it will be a Penetration kill, made this camo so easy to get since its a clear window you can see through and don't have to rely on a UAV+Piercing Vision.

Obviously only works till the truck explodes.

Anyone know of any other good spots?