New 2020 Ford engines for Super Duty (gas or diesel) who has one, or towed with one?

They are just hitting the dealers so probably not many yet. Join the Ford Truck Enthusiasts Forum, 2017+Super Duty (ford-truck.com/forums/forum279) and you might get more information. It's a pretty active forum and a few have had their ordered 7.3's delivered. I haven't seen any reports of anyone towing anything yet with either the 7.3 or the newly upgraded 6.7 diesel. Initial reports are good on both.