I have a few solutions for you, depending on how tall your RV is.
We have the MORryde StepAbove RV Steps for 21-3/4" to 22-1/4" Wide Doorways - 3 Steps # MR38RR it has a 9 inch drop and rise, 17-1/2 inch wide steps and they are 8 inches deep. This will work with entry heights that are 34-36 inches from the ground up to the threshold.
Next is the MORryde StepAbove RV Steps for 21-3/4" to 22-1/4" Wide Doorways - 3 Steps # MR58RR its specs are the same except the height requirement is... view full answer...