Was able to help out a kaka sucker that got stuck doing a turn around at our neighbors property here in the Santa Cruz Mountains. Full, the tanker had a 25,000 lb GVWR. I had the tanker dump the fresh water tanks. The Warn Xeon 12s didn't have a problem pulling the pumper.
Encountered P07D9 code, which translates to " Gear 8 Shift Incorrect Ratio ". The JT was using Adaptive Cruise Control (ACC) when the ACC stopped / messaged that ACC no longer possible. Then power dropped and the transmission seemed to slip. Could not get above 55 mph. A restart of the engine...