First time on the 7.3L Forum. We're a Cummins shop that has all of our service trucks inspected by a local gasser shop. The gasser shop calls today and tells me about this 7.3L that he's working on. The owner bought it on Ebay out in the Midwest someplace. Drove it back to PA, put a trailer behind it and it overheats. Runs like a clock as long as it doesn't have a load behind it. He cleaned the radiator, condensor, etc. Changed the thermostat...all the usual. It still overheats with a load. Does the 7.3L have any unusual issue(s) regarding overheating?