Guessing this reply is a day late and a dollar short. I've comfortably towed with my '19 Ascent for a couple of years without issue using the OEM setup. The vehicle has substantial power and handles quite nicely. No need for WDH per manual. Getting 16ish mpg with my fully loaded '99 2720 on the longer trips which usually included varied terrain and weather (mountains and wind) as long as I keep the speed to 60-62. Usually slow down for the longer mountain grades and allow speed to pick up for the longer rides back down. Many might suggest that the CVT isn't the best transmission for towing but I'm driving in a way that hopefully doesn't put too much stress on it.
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Cheers,
NorCal Gordo
'99 Trailmanor 2720QS
'19 Subaru Ascent
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