I dont know if you wrap ribs on the smoker but what I do is smoke 2 hours ish, smoke 2 hours foiled with dr. pepper in the foil, then take them off brush with a little sauce re-wrap place in a cooler wrapped with towels. If you do something similar to this the ribs should still be moist and warm for your 45 minute drive. A little different but these ribs are out of this world good and the family loves em so thats what matters.
edit:for baby backs that is.