They are dual purpose on Valkyries and spaceborn craft. (vernier/tie-down.) Thier sole purpose for ground/atmosphere based craft are as deck tie downs. IF you look at old aircraft decks you see the exact same shapes and those are used to secure vehicles to the deck.
Ha! You´re completely right Ranger565! I had completely forgotten this scene but the moment I read your post I remembered I had seen this too. Thanks a lot.
The RCS thruster theory might work from the look of it, but the non-flyable things such as destroids or maintenance cars have them too. There´s even a forklifter with one of these thingies, take a look at the Perfect Memory book!
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