Have never experienced the drag issue you describe. Have had the spare sag during travel. I use a ratchet cargo strap securing the tire to the mount just for piece of mind. Did ruin a mount years ago by cranking up the cable without the spare jamming the cable/gearbox beyond fixing.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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