Why does my Titan shut down while towing? on 2005 Nissan Titan

Towing my toy hauler (7500 lbs.) my Titan shuts down somtimes. Engine temp. has never been a problem. Could this be a transmission to full of fluid?

Asked by for the 2005 Nissan Titan
do you have any eng codes? thats the 1st place to start. trans over full prob not
1 more answer
have you ever had a exahust leak at the rear. a lot of time the exaust will rust through at muffler causing the hot exahust gases to melt the rear wiring harness, does only do this when towing, if so the trans may be getting hot you might need to add a external trans cooler, i am a nissan tech so i have seen some crazy things. here is my email