I'm not sure what you mean by, "a 1" gap at the bottom and fully extended at the top"...
When the slide is "fully extended" the inside bulb seal should be in contact with the trailer wall and there should be no gaps, no light infiltration and no air movement. When the slide is "fully retracted" the outside bulb seal should be in contact with the trailer sidewall and there should be no gaps, etc....
Sometimes, depending on the slide, the way the interior trim is stapled in place or other assembly "pitfalls" you might see a "trim gap" at the top or bottom but the seals should fit properly. That is pretty much a "cosmetic" issue and sometimes can be corrected, sometimes not.
The main (and important) consideration is that the slide fit properly, that there's no gaps to allow rain, cold air or dirt/dust inside and that the floor is flush and level with no flexing when you step on the edge.
Occasionally a slide may be installed in such a manner that it does have a "trim gap" but there shouldn't be any gaps that affect the seals. It's more important to have proper seal fit than cosmetic fit, although having both is optimum, if possible.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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