When we bought ours the dealer told me the earlier models with those steps had the locks but the newer ones have the spring loaded steps and don't need the lock. I have never had and issue with the steps bouncing or anything while on the road.
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Jim B
2017 Lariat F-350 FX4, CC, SB, 6.7 PSD 4WD
2018 MONTY 3731FL, at our private winter site in GA
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