We also have a 37SDF. If you are referencing the floor giving directly beneath your feet, we have no issue on our unit. If you are referencing how solid the trailer feel when moving inside, we had to add stabilizers to minimize shake when one of us walked around. I installed the Steadyfast system an it help quite a bit.
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2016 Entegra Cornerstone 45A
2015 Jeep Grand Cherokee Summit
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