Monaco recommends that you are at 'ride height' to move the slides in and out. But, my very reputable repair facility told me to move them in and out when leveled on the bags or hydraulic jacks.
My big living room slide behind the driver area started to become misaligned once as the coach was tilted towards the driver's side. It was at ride height (un-level site) when I tried to retract it.
The Facility adjusted the slide and told me to move them only when the coach is level. So, that's what I do and no problems so far.
As you know, the slides won't move with the motor running.
MM.