Yeah, to be specific, it is a light truck, so it's certainly more than the shopping, but not necessarily a 1 ton pallet/crate.
The latter will cause a faulty reading if you happen to read just as the crate hits
This comment I don't understand. I thought the arduino is constantly monitoring the analog inputs.
Again, as I understand it, it's just monitoring and seeing the load (voltage) change, but waiting to see a constant change before it reacts.