I run a 90hp tune on my 2018 68RFE.
Pull a grand design 28bh loaded with water, 12kpounds through Colorado mountains.
Make sure you click down a gear when you get into those 7% grades.
Slow down for the last 1/3 of the hill to keep the EGT down or under 1325-1350.
I never had a problem in 55,000 miles.
I usually hit those suckers at 80-85mph and hold it at 65-75.
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