My trailer (purchased used) did not come with one. I went to Menards and bought a Masterforce quick clamp/spreader unit. I trimmed the metal bar off so I could still close the cabinet door above the slide and simply use that. I attached a bead chain with a flourescent orange tag on it so that someone doesn't accidentally try to deploy the slide with the spreader in it.
2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.