28Z Four Winds 2011 28' Fourwinds Superslide 28U is Easy to afford easier to drive. 2011 Four Winds Intl. (Harberson RV is a Full Service RV Dealership) RV - Class C Class C 7108 PSN . With such a great floorplan and options it is easy to find the 28U is the right Four Winds Class C motorhome which is right for you. From the spacious superslide to the practical storage Four Winds International provides something for everyone...