Yeah it's been back and forth and it seems we all get different responses. I also think that this is a unit dependent issue as well. In my case and the OP. Our units have 2 opposing slides hanging past the rear axle which when you put down the stabilizers will flex the tail end of the unit. This could put added pressure on the back edges of the slides resulting in a bind.
A middle unit slide is going to react differently than a slide that has a stabilizer under it in one corner IMHO.
With that said, I have deployed and retracted under both conditions and have not noticed any issues. My issues all came from sequencing.
Just my observations with the longer units as there is frame flex.
2014 375 BHFS Eagle Premier
2014 Ram 3500 Longhorn DRW CC
6.7 CTD, Aisin, 4.10's