I've been processing moose for a long time.
An average moose in this country weighs 900 to 1000 lbs on the hoof which results in somewhere between 300 to 400 lbs of boneless meat.
I have several freezers here (Box Type--hinged lid on top)5ft long maybe 2ft wide and 3ft deep. An average moose will fill one about 3/4 full, cut and wrapped.