How often should I change the transmission fluid in my Ford Ranger?

I recently purchased a Ford Ranger and I want to make sure I am properly maintaining it. I've heard varying opinions about how often I should change the transmission fluid. Can you offer any advice?

In general, it is recommended to change the transmission fluid every 30,000 miles or every 2 years, whichever comes first.

However, if you frequently tow heavy loads or drive in extreme weather conditions, you may need to change it more often.