Lucky you Chris!!!
I've only been on one elk hunt but the guys I went with had been several times before and had some good ideas.
One thing we did was we each made a big pot of some sort of stew, gumbo, chili or whatever. Something we really liked but that was filling and nutritious. I made some hamburger vegetable soup with barley that is REALLY good. We were also camping at a spot accessible by 4WD truck so we could take bulky food. Anyway, we all made our favorite meal and then canned it in mason jars being sure to have a little more than we thought we'd need. At suppertime, we'd fire up the big gas stove with a big pot of water (like a canning pot or maybe a turkey fry pot would work) and set the jars in the water until it boiled. Lift out the jars and pop the lid. Hot and ready to serve! Bonus was that when you were done eating, you'd already have hot water for doing the dishes. Also, by only opening a jar at a time to serve from you cut waste because if you have a jar that doesn't get opened, you just pull it out and allow to cool and it reseals just like the first time you canned it. Just be sure to take the lid rings along too.
Another tradition we had for our trips was that for the first evenings meal, we'd all bring steaks. It's hard to keep steaks for several days in a wet cooler but if you plan on eating them the first night it just kinda gets ya off to a good start for trip. You could probably vacuum seal some and they'd be ok in the wet cooler but I don't have a sealer anymore.
Also, you can pack your clothes inside your extra ice chests for the trip out and pack along either some trash bags or canvas duffel bags to pack them in for the trip home when your coolers are full of elk meat. Think positive... think positive....think positive