Welcome to the forum.
The highest point on your rig should be around 13 ft 4 inch. I would build my cover 3-4 ft higher to allow room to get up on top while it is under cover for inspection and maintenance. Put your drain and water 15-20 ft from the back end of the pad and you will be good.
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Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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