A slide-out system for a recreational vehicle has a slide block that is form fit with a sliding connection to a track so as to vertically and laterally support a slide-out room relative to the stationary portion of the vehicle. The room is driven in and out by a ra ck and pinion drive and a synchronizing screw is provided at at least one end of the drive shaft so that two spaced apart slide-out units can be synchronized relative to one another and to eas e disassembly of the shafts and motor drive unit.
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