Here is a couple pics of 2 recent heavy towing trips from Denver to my home, all done in 40HP tow tune with no issues with EGT's or tranny temps, shifts etc
first 2 are about 16K lb trailer weight and the last one is 21K lb trailer weight.
6 pallets of Retaining wall block
4 pallets of flagstone, a diesel generator and 3 wheelchair lifts... and a pool table base...
