The (no pin slides) newest slides became available with the 2007 shells which means that they would be a 2008 conversion,they actually have only one pin which is under the slide.I have 2 in my 08 Liberty and they have been trouble free for almost 6 years.I had a in motion light that would stay on after I put a slide in,it would only happen if it had recently rained,Prevost Jax looked at it and found sawdust in the control area that was holding moisture and they vaccumed it up and there have not been any issues since.I am of the opinion that Prevost has engineered the slides with the chassis and that they really know what they are doing,I would not purchase a coach with aftermarket slides,I do know that the Featherlite slides have a good reputation but I think that Prevost will always be here to service their own products.