Well, since your feelings on dealing with the dealer you bought this rig from is pretty much nil (from another post you made), I would not feel any confidence in bringing it back to them..
I've got a fridge in my slide too on my new TT.. Mine is not hydraulic so don't know what the difference in the runners are for that, as this is my first slide ever as I was never really a 'fan' of them in the past... But you get spoiled real quick when you see it, then buy it, then use it!!
๐Anyway, good luck with it. I have no advise for you, other than maybe another dealer that handles your make and model of trailer and see if they can help??
Mitch
2013 F150 XLT 4x4 SuperCab Max Tow Egoboost 3.73 gears #7700 GVWR #1920 payload. 2019 Rockwood Mini Lite 2511S.