Its amazing what coolers can do, even regular Igloo coolers. You don't need Yeti's or K2s or Grizzly's. (Dont get me wrong, they're NICE, to have, I have a 120qt K2 and love it.)
But my hunting group has several 150qt Igloo coolers from Costco and we've used them from New Brunswick spring Bear to Montana and WY elk, deer and pronghorn.
Never an issue.
The New Brunswick Spring Bear we drove 17 hrs through 3 time zones to get to NW Ohio for our first leg home. When we got to Ohio it was 95°F with a heat index of 112° at the hotel, and them Igloo coolers worked like a charm.
If your traveling 30 hours there will be hotels and gas stations involved.
We like to load up on hotel ice (its free!) each morning. We get some strange looks, but never had anyone say "no". If that fails, gas station ice is perfectly fine too.
Several fellas I know prefreeze half-gallon milk jugs and 2 liter pop jugs and load em in their coolers before they leave for the hunt.
I dont do this cuz on a 5- 7 day hunt, they do eventually melt some, that and my wife thinks I'm crazy for storing 20-30 jugs in the offseason! That and those jugs don't "move" like chunks of ice. I can rearrange bags, or shift ice into cracks and holes between the meat. So I just get ice at the hotels/gas stations as needed.
I do check them every morning and resupply Ice as needed.
Never an issue.