That mile long 2 ga neutral on the pole is not going to carry all the neutral current from the primary so some of it is going through the ground no matter what. I suppose if they used delta distribution it wouldn't be an issue but they don't. I did see delta where the transformers were L/L in Maryland but never here. They had all three primary phases on the pole. Here it is one phase and a neutral.
https://gfretwell.com/electrical/Transformer%20connections.jpg
