Welcome! I am pretty new here too.
I don't know what the advantage to the scissor jack would be on an expandable. They are better at lifting, but you really don't life the trailer with the stabilizer jacks. Maybe someone else can comment.
Model X19H Expandable
GMC Sierra Pick up
Been a camper since I was a kid, and that was a long time ago :)
From pup tents with no floors, to tents with floors and flies, to a pop up, to the expandable.