I don't have a HW but my pop up does this also. Asked the tech when we did the walk through and he said that is how ask the forestriver are and it is normal. We don't really notice it sitting on it either. They said do not put anything underneath to support it either. It will mess up the slide. Ours is new. So it should be normal.
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2014 Rockwood Premier 2514G
2010 Ford F150 Lariat
Nights Camped in 2016-33
2015-22, 2014-22, 2013-2