We've replaced the original RV queen with a full memory foam queen. It was difficult to lift and of course it wouldn't stay in place once lifted. So I bought these lifters in the heaviest models available - presumably they could handle a full memory foam king. Installation was easy as these racks were the same size as the original ones. Once in place I was very disappointed that the bed didn't hold up. Will return to the place. Yes, now lifting is easier and lowering is slower. But I need them to keep the bed upright while we load and unload the storage space. Expensive modest (but not sufficient) improvement.
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