Welcome to the forum.
Slides - they do not operate with the engine running as a safety feature. wouldn't want you to take off down the road with an extended slide.
Fridge, on my prior class c I found that the RV fridge (mine was Dometic) would take considerable time for cooling on electric or LP when we were getting ready for a trip. I bought a small fan and placed it inside the fridge which improved air circulation and we never again had the issue.