Well the maintenance guide gives you three schedules as follows:
Schedule 1: Severe conditions such as repeated short trips, stop and go traffic in hot weather, low speed driving for long distances. Driving in dusty conditions, rough, muddy, or salt spread roads. Towing a trailer or using a camper or car-top carrier.
Schedule 2: Highway driving, temperate conditions, and/or conditions other than schedule 1.
Premium service. This reads like a "how to enrich your dealership" guide and tacks on additional service to schedules 1 and 2.
To answer your question about transmission fluid, the manual shows no service required for schedules 1 and 2. Premium service calls for a fluid change at 30k mile intervals.
I've basically stuck to schedule 2 for most services but I do a drain and fill on the transmission fluid every 30k miles and all the other fluids (differentials, transfer case) at 60k mile intervals.
You can download the maintenance manual here:
https://www.google.com/url?sa=t&rct=j&q ... Wc&cad=rja