My 2006 F350 diesel overheats when towing very small loads (5000 lbs). What are the possible problems?

The links below should help:

. https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-3.html#post235973

. https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-10.html#post1923468

I've worked with ranchers who haul 13 head of cattle to market in 100 degree+ weather and their F-350s don't overheat. I get them to use Mobil 1 full-synthetic products in their transmissions and engines. It definitely helps them run cooler. Remember, transmissions cool through the radiator; therefore, anything you can do to reduce transmission temperature reduces the load on the cooling system.