I would totally agree with your method, keep as level as possible while operating the slides, but in my opinion they aren't quite as fragile as they would have you think, it's a CYA thing on their part. We extend our slides at rest areas for lunch all the time without leveling & no problems in 10 years of fulltiming with 3 different 5ers.
The stabilizers are just that, they weren't/aren't designed to "level" the coach so there shouldn't be so much weight on them as to flex the frame in any way. If you have abused them to the point that the weight is off the axles, then I'd agree the frame may be sagging in the middle, if doing this you aren't using the "stabilizers" correctly & they won't hold up to that kind of weight.
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