2015 Forest River Flagstaff Shamrock 21SSL, FLAGSTAFF SHAMROCK FRONT DECK STORAGE 21SSL EXPANDABLE HYBRID TRAVEL TRAILERS Whether you are interested in the expanded interior space provided by the spacious drop down bunks with heated innerspring mattresses or the ability to bring an ATV along with the feel of a traditional trailer, the Flagstaff Shamrock will deliver with the quality and amenities you expect. Flagstaff brings the necessities of residential living on the campsite.