When I bought the trailrunner I decided we needed a third step (ours has 2 from the factory) Here's the rub: Pull out steps are 25" wide. Fold down steps are 27 1/2" wide. I wasn't able to find anything in a 3 step system that would work. You may be able to get a 2 step from HL parts if that's all you need, BUT measure it out first and see what you have. ED P.S. I believe Lippert has the info you'd need as far as dimensions on the steps.