To my knowledge, the VB-6 does not have landing gear. There's no lineart for it in the Design Works book, and every single instance of it being on the ground has it in Gerwalk or Battroid mode.
Does anyone have any information to the contrary?
I haven't seen any line art with landing gears either but I still maintain that such a machine would require some kind of add-on booster to go back to flight mode from the destroid form. Once on the ground it would be protected by lighter battroids while bombing the crap of it's enemies from a safe distance, battroid mode would be used only in last resort situations when the destroid would be surrounded and would need to engage in hand to hand, close quarter combat. I'd say that in battroid mode, the VB-6 could inflict quite a bit of damage due to it's sheer size and weight. Once the mission is complete, a crew would come and add some kind of booster to the destroid to allow it to go back in space, I say this because if you need boosters to send a VF-1 in space, just imagine trying to send the VB-6 in orbit on it's own, very unlikely... Landing gears may also be futile due to the weight of the bomber mode. Just try to imagine looking for a landing surface that would be strong enough and wide enough to withstand a landing from this beast.
I know that this is totaly not official info but I just think it makes sense.