Hello, i am here to bring to this project my personal idea (if ever it was not already given or made) : The goliath.

Ironically this is nothing about an enormous vehicle. it is in fact a tiny treaded metal box full of explosives commanded from afar, in order to approach tanks or other stuff in order to damage/destroy them.

TL;DR : A sentry buster but that looks like a tiny tank chassis.

PS : This concept was made during WWII.