They might be mounted to both and its the step frame flexing. There is a device called a step brace that is adjustable and goes under the first step that lessens the flexing especially with heavy folks.
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Retired Navy
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho
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