Transmission fluid temps after short hill climb towing

[time4save]

1.5 mile fairly steep climb where I was averaging around 10mpg with a 2500lb trailer. Seems the fluid got pretty hot even on that short a climb. No lights came on as I was almost at the top by the time I took the pic but not sure what I would have done if the road was any longer.

are there aftermarket coolers suggested?

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[bakutheleo]

Not answering your question, but as long as it is not in the "too high" zone I would think it should be fine. The question then would be does it get too high if you did push it longer/harder?