We have a 2013 Black Stone the movable drain is nice for aiming your hose to the drain. I added a 4" square vinyl post above my bumper, this carries 3 lengths of 4 inch. Sewer pipe cut length ways to 1/3. Then I, cut four sets of 1 by 4, 2 @16", 2 @12, 2@8, 2@6", then cut the 1 by 4, making 4, 4" blocks. I slid one piece of the sewer pipe into the drain support, then lay another sewer pipe to the drain. Using the 1 by 4,legs I screw the blocks to the required height of the sewer pipe, usually two supports are required, connect the slinky, lay it into the trough. Jobs done.
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