I'm a little late to the party, but I have the same floor plan as you and I just adjusted my slide recently. I just had to raise the one side of my slide in order to centre it in the opening, so I used a single bottle jack to support the weight of the slide (slide retracted) and loosened the bolts holding the roller bracket to the wall. Using the jack, I lifted the slide up a little bit, then moved the roller bracket up, tightened the bolts and let the jack pressure off so the slide came down and rested on the roller again, now in a slightly higher position.
If you're looking to raise the whole slide, you would need to get 2 bottle jacks, or just do 1 side at a time. There is a bracket in the middle of the slide which is part of the extending/retracting system, and it would also have to be moved upwards as well, by using the same method. It's just a matter of positioning the 3 brackets bolted into the wall under the couch.
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2013 F-150 EcoBoost MaxTow, Roush tuned (415hp 506tq), lifted on 33s, R.A.S.
2013 Jay Flight 28BHS Elite (Equalizer 10K hitch)
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