We learned to trust the transmission and engine to keep the speed down. When we see the signs for a downgrade; we set the cruise control 10 mph below our desired speed of 45 mph. We are able to maintain speed without going over 4200 RPM, or using the brakes during a 10 mile descent on I-70 west bound from Denver. On long grades we follow the speed warning signs for truckers. Once you get used to the engine rev and handling, you may want to add sound proofing to over your transmission and inside the engine cover. 2019 RC-25 Quantum (w/cargo trailer, 2 Harley-Davidsons) 2018 E450 Chassis
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