What Jamie said, tow/haul mode all the way. In a 37' with the V-10 I would start down at around 50mph tops, the engine will soon find the right gear. When the rpm's start letting you pick up too much speed you can use a little brake to take some speed off and force possibly another downshift, just don't ride the brakes or you will eventually experience "brake fade" because they will get too hot.
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Full Time in 2017 Newmar Ventana 4369
pulling a 24' enclosed (Mini Cooper/Harley/Kayak)
(traded 2014 Thor Challenger)
US Army 70-73 Retired LEO
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