I am lost. Cant seem to figure it out. My truck still overheats while towing my trailer. (16k lbs) It is an 05. Headgaskets and studs put in 3yrs ago. Oil cooler has been replaced. Fan clutch replaced. EGR cooler upgraded (under warrany) with Neal Technologies cooler. EOT/ECT are within 10degrees of each other. Runs great with no trailer even with ID Extreme Street. Only pukes with trailer attached. Thermostat replaced and waterpump inspected and seems to be fine. My ECT/EOT seems to hover around 200-210* on my autometer gauges. Took a tech for test drive and his laptop says my gauges are off by almost 10*. Does this sound like HG's?