I'd get several airers and put them in individual bedrooms or one in the bathroom? That way their jeans would be "ready" when they were ready to dress and towels would have a little more space if the airer was one of those cheap plastic ones that stand in the bathtub. Someone taking a shower could put aside (back of door hook?) the fresh towels from the hanging to use and moved the ones in the process of drying in the tub to the hanging/towel rack for the next person. Have a 3 way circulating towel use thing going depending on what was dry :-) Or, assign each person a towel a day (color-coded?) and make it their problem to dry it, using a combo of dryer and hanging or something.