my first bull in 1996 co-harvested with my battle buddy (KIA 2004).  We shot this 40" bull down in a steep valley floor, 1/2-mile straight line from the truck/road.   Zero experience with the actual weight of moose meat nor the volume.  We had army rucks and blazed a packable route up and down this 15% gradient.  Cookie trailed 1.2 miles one way.
Took us 2 long days and we had to debone it to pack it up hill.
That winter I bought a 13' American Camper raft from K-mart in Fairbanks and changed my hunting strategies.  I vowed to NEVER shoot a moose more than 300 yards from camp.  For 28 years since, I have not.
From experience, if you think you have to, you really just need learn better ways to coax them across that gap.  I've dragged 30"- 67" bulls that varied in weight from 400 lbs to 720 lbs.  Trust me, that shit hurts even short distances.  Because of that experience, the last 15 years I can't recall packing one even 100 yards from the river/camp.