We're talking about a 5 or 6 year old trailer with a heavy gas/electric refrigerator on one end of the slide, no idea if the trailer has been "torqued or twisted" or if the frame is still relatively "in line, straight and level as it sits"...
Think about the slide construction, a 4 sided aluminum box with a 5/8" plywood floor (subject to being wet from below, repeated drying, warping from the weight of the refrigerator as the floor dries, and if stored extended faces a different "weight condition" than if it is stored retracted, with the slide floor not supported, but "hanging freely in the air"...
Essentially, from a functional perspective, if the refrigerator is level, if the slide, when retracted is sealed at the outside wall/slide flange gaskets and if the slide, when extended is sealed at the inside wall/slide flange gaskets, then I'd consider any "difference in measurements at the slide ends" as "personality of the individual slide"...
As long as the slide isn't riding on the vinyl flooring, not damaging the trailer or the slide during movement, seals properly when open and when closed, I wouldn't start "winging adjustments to make the measurements with a ruler look closer to symmetrical when it's closed"... Doing that (or trying to do that) may throw the entire slide out of alignment and you'll wind up with "sunlight in the corners" either when towing or when camping....
If it's functional, seals properly (extended and retracted) and doesn't hang up on anything while moving, I'd call it "working better than most 5 year old slides with a refrigerator in them".....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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