It's sometimes a limiting factor in heavily treed lots, where you need room on both sides for the canopy & fold-out, but I imagine some slide-outs create similar issues. Having the bed over the dump valve should not be an issue if you do things right & avoid spills, but you may whack your noggin a few times when dumping.
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1967 Me, 1962 DW, 1998 & 2003 DD's
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