I'm specifically curious about the "A-A5 Speeder Truck" and using it as a LOS blocker, but the same question could apply to the "TX-130 Saber-Class Fighter Tank" or the "AAT Trade Federation Battle Tank" and there might be others. All of these units have the "Hover: Ground" keyword as far as I am aware.
I'm unclear on exactly what the silhouette is for these units. I think that the relevant portion of the rulebook is on page 37:
Does the volume of the silhouette extend all the way down to the base? Or is it possible for a unit that is in base contact with the vehicle to draw line of sight underneath the vehicle to another unit on the other side (for the purposes of performing a ranged attack or other LOS actions like Aid?
Thanks