When I bought my RV, there was no slide lock included. Reading the Winnebago manuals, I read that one should have been. I went back to the dealer and asked for it, and they gave it to me. I have never needed it, but I have it.
Bobbo and Lin
2017 F-150 XLT 4x4 SuperCab w/Max Tow Package 3.5l EcoBoost V6
2017 Airstream Flying Cloud 23FB