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New two-layer radiator was installed a few months before I purchased the truck (1 yr. ago), has 6 blade clutch fan that is working properly, again has new NV-4500, fan in front of radiator, and have a separate cooler for AC but didn't run AC on this trip. 5th wheel weight is 5,500lb unloaded and 7250lb fully loaded so she was properly around 6,000lb. so that is a little better than 1/2 of what this truck can pull so I don't think I would consider that being a heavy load for a dually with a 410 re-end and a 5 speed trany. If I wrong, I want to apologize in advance.