Scorpion

The rogue

When this stealthy vehicle goes into low power mode it's almost impossible to notice, both visually and on scanners. Especially during the night.
It's often used for exploration, spy and recon missions.

The scorpion has a nasty tail laser, which does a lot of damage for such a small vehicle, but it takes some time to rebuild power after it fired. 

 
The Scorpion doesn't have flying capabilities but is deployed to asteroids by a Sowbug, which has a hangar with 3 Scorpions. 

Zorth units with legs, like the Scorpion and Hornet are very good in dealing with rough terrain.