Gun-jandrum
(Based on ww2 panjandrum)
Two giant wheels on the backpack that let it roll around
If they're from the stargazer Gundam they can also be spider legs
It'd be heavily armored, have several missile launchers and a bazooka, and have a steampunk look
(Other than the two stargazers idk what I'd use for this)
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Note for gun-jandrum
The panjandrum was two giant wheels with rockets and explosives designed to get over rough terrain and bust through a concrete wall
It failed spectacularly but Adam Savage almost made it work
These silly weapon prototypes may be the only aspect of history I'll ever find interesting