I foil the meat, cooler it and I have a bunch of old beach towels, you know the kind that come from the dollar store, but are still pretty thick. Several of them in the cooler acts as a very good insulator. You should be fine with your plan but keep a probe in your meat just to be sure. That balmy Savannah weather should help as well.
Coastal Carolina Catering
Klose custom 28'x7' Golf Pro Classic mobile pit.