Temps Normal?

Yesterday I was hauling between 19000-20000lb squash on I'm guessing a gooseneck that weighs 5000 and my truck weighs 7500lb totaling around 32500lb gross while running 35" tires. I did the message center trick and my coolant temp never rose over 111 degrees which seems kinda cool for a diesel compared to tractors and other equipment I run. I was loading the truck heavily up some hills and it would only hold about 45-50 WOT. Just wondering how the coolant temp relates to the engine temps and make sure everything was in check. ambient air temp around 98 degrees.

Thanks