Since you will be resting the loin once it is ready . I would warm up a cooler with some hot water for about an hour before the loin comes out, say about 3 gallons of real hot tap water pour it in close the cooler up. Once the loin is ready to come out drain the cooler. wrap the loin up or put it in a pan that fits in the cooler and cover with foil.
Place the loin in the cooler. cover with a few clean towels close it up while the ribs finish off.
I do this with pulled pork and Brisket now and I find if I let it cooler rest for at least an hour and a half it makes for a much better product.