[ImperialCrown]

If the dealer has a 'Road Force' tire machine, that may find a shifted belt or some internal tire anomoly that a visual inspection or tire balancer won't find. You can balance an egg, but the machine will get the most minimum tire/rim runout possible. Some tires will not fall below minimum, this tire will fail and needs replacement. Maybe it can be used as a spare?
I realize that the dealer can only road test a vehicle within the legal speed limit and follow other traffic laws.