On my unit, the bedroom, bunk and kitchen slide outs are schwintek. The dining and recliners are on a regular hydraulic slide.
As for the gaps, they can be adjusted by your dealer. (Or by you if you're handy)
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2016 North Point 377 RLBH, with a few mods
2014 Ford F350 Platinum, CC, 6.7PSD, DRW, air bags, Curt Q25 hitch