I don't think it is supposed to lie flat.
Living the Dream in our 2015 38RL: 1600 watts solar, 800 ah lithium, slide in slide, residential refer, washer/dryer, Moryde 8K, H rated tires, Kodiak disc brakes, Drainmaster system, SeeLevel II
Our big girl is dragged around by our 2019 RAM 3500 Limited DRW
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LOVE the Full Time RV Life @OurRomanyLife