I found the original military tarp cover for the trailer yesterday in my storage unit. It came with the trailer when I originally purchased it. Its in great shape but there is a slice in the rubber rope that weaves in and out of the tarp eyelets and secures it to the trailer. It still works but you just have to watch out for it when using the tarp. A replacement style of rope could be used if it ever broke most likely. $75 bucks shipping not included.
Can send pics if you need
Can send pics if you need