I recently changed my coolant and coolant filter. Like Post #6, FL was adamant about not using ELC...there is no real value anyway, they said both should be changed at five years or 100k. You might look around for a coolant filter. FL said there was not one, but they didn't know that DD put one on.
Re the trans oil. According to Allison, if it is chemically tested annually and comes back good it's good.
2014 American Eagle 45T
DD 13, 500 HP
Pulling a Honda CRV