Chrysler Repair: overheating, chrysler concorde, 2000 chrysler concorde

Question
I have a 2000 chrysler concorde, 3.2 engine with 6 cylinders. Which runs great. I am currently trying to move out of town. So i have a 5 by 8 trailer hitched onto the back of my car. Ive tried to leave twice but everytime i get on the highway with the trailer attached the car starts to overheat. I have already replaced the radiator, thermostat and upper and lower hoses. When the trailer is not attached it doesnt overheat.Im located in Arizona so the temp is 100 degrees plus 99% of the time. When i moved out here i had a larger trailer attached to my car and everything was just fine.Can you please help me?

Answer
cars are not designed to tow  U change the operation of how it works thing like overheating happens. Why it is doing it now I cant tell u  If the tow is not hooked up are u still over heating yes or no?  if its no then it what u are doing yourself to make it over heat and nothing wrong with the car itself.