Seeing as there is a rather limited amount of points when you are fighting on the ground, I started experimenting a bit on what determines the outcome of the first unit on the ground, and it seems to be that the unit (after the battle) in the first slot is also the one who is put on the ground first.
I then decided to see what happened when I moved the wanted unit (in my case, Mara Jade) to 'Fleet 2', and invaded, selecting 'Fleet 2' (dragging the mara jade icon), the planet. Voilб, Mara jade popped up on the ground first, and I was ready for some termal detinator mayhem :).
Thanks, this will help my invasion alot. It's so annoying when speeders are the first thing on the ground.