Has anyone had problems with the transmission running high (never reaching the red line) when towing? I tow a 30' travel trailer and when I go up an incline the temp gauge for the transmission rises to just below red line. Then when I level off or start back down the hill, the temp goes down.

I was told by the dealer that is not unusual when towing and that as long as it never "red lines" it is okay.

What have others experienced?