Hmmm Camper/toy hauler. I seen a nice write up on Pirate awhile back where someone took one of these and converted it to a camper/ hauler and looked pretty sweet.
http://www.commercialtrucktrader.com/medium-duty-trucks/find/listing/1988-international-s1600-90820077
http://www.commercialtrucktrader.com/medium-duty-trucks/find/listing/1988-international-s1600-90820077