Based on your measurements the # MR78RR would be the correct option from MORryde. We also have the strut assist version available which is # MR65RR. The doors may not close properly if the threshold is outside of the 5/8" - 3/4" range so you might need to add some extra material to the threshold to use either of these.
We do have steps with an 8" rise that will fit your doorway width of 28" and entry height of 34". The Lippert SolidStep RV Steps # LC791572. The steps aren't quite as wide... view full answer...
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