Theoretically it is fine. I cannot recall a bumper failing that only had a spare tire on it. Bike racks are really bad as they are cantilevered way out.
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2012 Jayco X23B
2020 Ram Laramie 3500 SRW Air ride 50Gal fuel tank.
2007 Dodge Dakota Quad Cab (retired from towing) Equal-I-zer 4-Point Sway Control