FWIW, on a solo pronghorn hunt in hot, dry remote country, I brought a game-hoisting tripod in my truck. (Similar to the trailer-hitch hoist/gambrel mentioned in another's post.) I got my pronghorn in the evening, packed it back to the truck, and then skinned and hung it that night because I couldn't get back to town until the following day. Luckily, the air temp cooled some at night and there was a light wind that quickly cooled and dried the meat. I deboned the first thing next morning, and put in the cooler until I could make the hours-long drive to get to town to load the cooler with ice, and then the 13-hour drive home before final processing and vacuum sealing.
This worked for me on that particular hunt, but of course I should have loaded the cooler with ice before driving way out to where I chose to hunt.
As others have said, important to try get your pronghorn cooled quickly, to avoid bone souring the meat.
FWIW, you can boost your coolers' performance, if needed, by wetting a fleece blanket on top of your cooler(s). I'm not a scientist, but this creates evaporative cooling, like the old blanket-covered canteens. I also use this wet-blanket trick to keep the horses' water from getting scalding hot in the water tank on top of the horse trailer in hot, dry country. In my limited experience, i use a fleece blanket because it cleans easily, doesn't stink, and doesn't require as much water as a cotton blanket. Good luck and enjoy your hunt.