I would stack bales NW to SE. The snow usually falls with wind in the SE then it switches and blows the snow from the NW. This way it wouldn't pile up snow on or near the bale row. Never done it, just seems logical.
I bet the tractor came with the bin sight when the farmer bought all those bins. Looks to be a 13 inch but could be 16. I don’t think her boss is a cat man form what I know of him