I pulled my father-in-laws TT about 150 miles this past weekend down to the river where he is parking it for the weekend. Dry weight was around 3800 lbs. maybe 2-300 more in gear and supplies. I towed in 4th. My truck is non BT, stock tires 245/75/r17. I went 60 most of the way. In 4th rpms at 60 were around 2000-2300ish there was a few good size hills, but the truck didnt seem to labor on any on them and maintain speed. after reading on here I guess I am paranoid. So I want to see how it performed on the hills, from 60 pressing the gas gradually it didnt down shift and I got up to about 67. I figured the load of the trailer, going up a hill, and pressing the gas the tranny would downshift. So the next big hill half way up i shifted to third and rpms jumped to around 3800, I think. I left it the until the top of the hill about 1 mile later, it seemed a little unnecessary but again I am now paranoid. I am going to order a temp gauge soon. Should I be worried about my tranny? Or am I just being paranoid?