I do use the lower gears but on long grades pumping the brake it still get hotter than I like. Some of the grades are 7-8 miles at 7%.
Don't pump the brakes. Read again what I and others said about how and when to brake.
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Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.