I use a 12 x 16 tarp which cover almost the entire H16. A very small bit of the hulls stick out the ends of the tarp. The 12 foot side is across the boat and the 16 foot side is lengthwise. I stretch it over the mast and then run a line from one front corner through the lower trailer mast support brace to the opposite front corner. This pulls the tarp tight, forward and down. At the rear I do sorta the same thing. The tarp is stretched tight and sheds water. I buy a silver tarp at Lowes and replace it every season. It cost about 22 bucks. Seems pretty effective. Of course a nice covered and dry storage would be great, but I don't have that option.