I started bringing a 7cu ft chest feeezer and a honda 2000w generator years ago. It fits perfectly under the topper of my truck. This is a gamechanger - you can handle it yourself (empty) and I bought it off Craiglist for $40. I bring a small cooler for things I want cold (not frozen), and keep a stash of frozen things in the freezer. You can replenish ice, or the blue frozen ice packs with the freezer, or keep a stash or frozen food for later in the week in there to thaw out half way through the trip. You can run the generator for a few hours in the evening to keep your goods frozen for days on end.
Then when you're successful, a boned out mature bull elk will fit in the freezer perfectly. You can stay in the woods longer and don't have to rush home to take care of the animal. I shot a bull on day 3 of a trip, got it half froze in the cooler, kept hunting for my buddies bull and got him on day 6. Without that freezer, it would have been a pain in the butt to keep that meat cool (and dry) with ice.
Pic attached is the bull in my profile pic.
Edit: you could also run the freezer off an inverter to your truck as well. They don't draw much energy at all.