It’s a Battletech “Rommel Howitzer” vehicle. Really stands up and works as a Cybertank at 3mm scale. However, my dream of BOLO-dominated battlefields is finally coming to fruition with the release of the Microworld modular supertanks. Could NOT be happier about that.
But to avoid sidetracking the topic here, another few possible options:
Darkest Star Venturian vehicles at 15mm scale:
Clearhorizon “Hura Technocracy” APC (heavier modding needed):
Clearhorizon “Nemesis” scout car: