Bring a tarp and some bungee's. I got one on opening of rifle one year when we had a warm spell in late Nov, got into the high 60's low 70's and did not get out of the 50's at night, dressed it, put in bed of truck then put a couple bags of ice inside, one on each side then wrapped in tarp left in bed of truck. That was on a monday, dropped off at butcher on thursday with barely any melt off. Butcher said all meat was still good and thanked us for doing that because he was getting a lot of bad meat from guys not icing down with how warm it was. If you have other options I would use them but with us, this was the only option because our hunting area is on public lands and 3.5 hrs away. Same process would work if you hung it neck closest to the ground.