2013 Outdoors RV Black Stone 240RKSB, 2013 Outdoors RV Black Stone 240RKSB The BlackStone product line is for the customer that is looking for the luxury features that are normally found in motor homes or larger 5th wheels but do not want the size and weight. Black Stone consists of 5 travel trailers from 28-34 feet in length and are the perfect fit to pursue the luxury RV lifestyle. One of the main features this customer is looking for is interior and exterior storage - with one look at the Black Stone they will see that this product has been designed with them in mind.