The closest option that might work is the MORryde StepAbove Strut Assist Fold-Down Step for 23-3/4" - 24-1/4" # MR75RR but since you are technically 1/2 inch too narrow you might have to look into a slightly wider door frame.
This will work great with your threshold height of 40 inches as well.
Lippert does not have a SolidStep in the quad step design that come close due to your doorway width. view full answer...
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