Yes, the SolidStep Manual Fold-Down Steps # LC698799 is 22" wide, so it will fit inside your 23-1/2" wide door frame. There are also some other options that I like a lot that would work if you find that your door is slightly smaller than that.
You could also use the TorkLift GlowStep Revolution Scissor Steps # TLA8103 . These are one of our most popular lines of replacement steps because of the high quality you get with a TorkLift product and the glow in the dark tape on the steps. This... view full answer...
When measuring to fit a Lippert SolidStep Manual Fold-Down Step # LC713662 you will measure between the door frame flanges - the doorway width - and round up to the nearest even number to determine the step size that will fit into your camper's doorway. The SolidStep # LC713662 require a door at least 24" wide, but there are some other available options for different entry heights and widths.
If you've got a different measurement just let me know and I can help you find the correct SolidStep... view full answer...