I suspect it is normal. They use a small motor with big gearing (like a bicycle in "granny gears" or cog 1, gear 1) because it has to lift such a large weight which sometimes includes the tow vehicle.
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2015 Ford F-350 XLT Ruby Red 6.7L Powerstroke, 4x4, Short Bed, Andersen Ultimate Hitch
Cougar High Country 299RKS, Mor/Ryde pin box, 200w solar
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