OK - as a licensed vendor cooling is without a doubt the biggest challenge. With turkeys it's a huge hassle. I would strongly recommend selling them off the smoker the day of (pre ordered of course). And remember somebody picking up a turkey at 9 am and not eating it until 2 pm is likely to get a little sick or they put it in a turkey roaster for 4 hours and it dries out and is a mess.
Every year people see this as a money maker for a little extra holiday cash but the risk is huge. Cooking a couple for neighbors and delivering them at noon-2 for immediate consumption is great but anything else - well it's your risk.
Retired competition cook. BBQ mentor.