I'll just add my experience. I have a 1999 Plymouth Grand Voyager with the factory towing package and a 1999 TM 2619. I use only a WDH. I have over 18,000 tow miles with the TM and over 102,000 miles on the TV. Haven't had the hitch drag once. I do replace the coolant and transmission fluid every two years.
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Rick Newcomb
2012 TM2720
2008 Toyota Highlander
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