I'm planning a trip like this with some considerations:
-2 trial runs with deer in 2019 with the same gear I'll be using on elk. The first was gutless method and a short hike, but good practice using gutless, game bags, and distributing weight in the pack properly (total pack weight ~ 85 lbs). Gutless took an hour the first time, but additional practice will shorten this. The second was a much larger deer, bone in, 1.25 miles in rugged terrain, ~ 120 lbs pack weight. Everything worked as I thought it would, except I realize I need a method to secure my bow to my pack so my hands are free on the trekking poles. Caribou game bags were a big winner.
-Part of my trip planning is self-imposed distance limits from carcass to cooler for killing a cow elk, based on air temp, and difficulty of terrain. My distances are even shorter for a bull since it takes more time/trips.
-Adequate strength/fitness prep. I can backpack 30+ miles in 24 hours if I put the time in to prepare my body in the months prior. Consuming 8-10 liters of water in this span is not out of the question if it's warm/sunny. Avoid the pitfalls of overdoing it, skipping breaks/rest, risking injury, or losing mental focus to descend into panic, despair, negativity, fear.
-I've found deer to be somewhat forgiving in how quick I need to get the hide off to cool the meat, but an elk is a much bigger animal, and is well-insulated from the outside, so I know how crucial it is to break it down and get the meat hung and cooling while I implement my pack out plan.