I read the original post, the follow up and the last post and I am not sure what you are asking. A Class A is a Class A be it gas or diesel so no difference in steps. In the first post you seemed to be concerned about steps due to a knee replacement and the last post you say "I was not referring to my knee". Steps are steps be they Class A, Class C or household. If you could clarify a bit about your concerns we might be able to give you a better answer.