I've coolered pork butts for seven hours and they were still steaming hot when I pulled them. Just resist every urge to open that cooler once the meat is in there. Don't be constantly checking it to see if it is hot. Foil wrap, put old towels in bottom of cooler, put in meat, fill up the rest of the cooler with more old towels. It wi be fine, maybe even the best ever.
XL Big Green Egg, Weber kettles, WSM 22.5" and Pellet Pro adapter