Hey I was playing a game vs my dad, and during the game I came across the fact that how should I move my Big Gunz and what happens to them when I do.

If I move them through cover, do I do it like there moving as infantry? And roll 2d6? Or do I move them as vehicles and if I roll a 1 its immobilized? And when I do move them can the guns still shoot?

And can I shoot the Grotz also while I shoot the big gunz?

Thanks for any feedback!