Advice I got and my experience towing a Jeep Wrangler on a car trailer makes me use the T/H setting. On one trip segment in the mountain west I forgot to engage the control and I ended up with a check engine light. The code was for transmission temp alarm so I am careful to use T/H in my new ACE as well. Although the engine will rev at times in steep downhill runs you can easily relieve it by some accelerator pressure. Two things scare me ... feeling unsafe on a down grade in an RV (speed, turns, crosswinds)
and crossing a harbor entrance in my boat with a heavy swell and an outgoing tide. Both situations are subject to operator control.
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