I have kwikee (two steps) going into my 2005 motorhome. They work correctly. My problem is a friend of mine said he thought they are broken, he thinks because they move a little bit down when you step...
Remember with the two step unit you have the bottom step located further from the mounting point therefore acting as a lever which will add some give to the steps too. Many of these are mounted only to wood (floor boards underside) with little to no anchoring to any kind of steel framework. Just depends on the coach/trailer builder.