Auto-Level - Slides In or Out??

[swthurmond]

I have seen a lot on using the auto-level systems but not much on whether to do the auto-level with the slides in or out. I am pretty sure that the sales folks told us to level the trailer with the slides in, but I have seen it both ways on different forums.

What are the thoughts here? We always level the trailer using the auto-level and whatever blocks are needed, and then extend the slides.

Thanks in advance.