Rhino flex. The rain gutter idea is brilliant. We use two 2x6s that are cut to fit crossways in the bed of the truck. Lay the hose on those and slant them as needed for flow. Place 2x4 stubs underneath for angle as needed.
Had two cheapo vinyl hoses that came with the camper for about a year. On their last trip I was only draining gray water, but it was shooting out of holes and seams. Bought the rhino kit from walmart the next day and tossed the whole cheapo assembly. Will buy another rhino if this one ever fails. Going on three years now.
