It should be a NEMA SS2-50R.
Make sure the cordage you have is 4 conductor 6 AWG, sometimes the ground conductor will be 8 AWG. Many 240 VAC cords wii only have 3 conductors as they do not always use a neutral conductor. That will not work in an RV application.
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2021 Newmar Baystar 3401
2019 Jeep Cherokee Trailhawk toad
2017.5 Forester 3051S Traded 7/2020
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