The A-A3 dray light speeder truck from the FnD Core Rulebook doesn't list a maximum altitude. Should the altitude limit be 3 meters, like the A-A5 heavy speeder truck? Or would you make the limit something else because it can supposedly be used as an exploration and backcountry sports vehicle?

I go with 3m. From the description, I see more of a flatbed farm truck than anything, so something pretty civilian.

A-A5 is 3m so I would go with 3m too