This could be a bad fuel pump or transmission issues here.

Without more information it is hard to determine the actual cause of this to happen. If the fuel pump is not allowing proper flow it will cause the condition. But if it only happens when towing this can also be related to the transmission. What it does it puts it into what is called limp home mode causing the condition you have described.

You need to have diagnostics run, testing the fuel pressure if something is wrong it will show being a few notches off. If that is good run diagnostics on the transmission checking the torque convertor clutch solenoid as this could very well be at fault here.

If they can retrive a code it will help determining the cause. When the vehicle sees something abnormal and goes into limp home mode it will present a code in the computer. Even know you do not have a light on a expensive handheld will show the codes that are from the incident. This makes for much faster troubleshooting. This is necessary on newer vehicles in which they are run off all computers and electronics. This condition is present to perserve the life of the vehicle.

Please do not leave negative ratings. If you need more information just reply instead. Thanks