A couple of other things. I have clear plastic trays with snap on lids. One for Rhinoflex sewer hoses, one for water hoses, both white and green, and one for electric extension cords. Also two halves of a concrete block tied together to hold the business end of the sewer hose in the hole where it belongs. You don't even want to think about what happens if your sewer connection pops out of the hole while you're dumping. Its never happened to me, but I've seen it happen. If your single hoses are a foot short of reaching the hookups, you might as well not have them at all.
One more thing. Disposable plastic gloves.