There have been different theories on its purpose such as it was a recovery vehicle, although now being disputed as the boom isn’t designed to tow, nor is it strong enough to lift extremely heavy weights, nor were there any other bits of equipment common on recovery vehicles. A later theory is it was a field modification, most probably to a damaged tank, removing the gun and replacing it with the boom, and using it as a mine clearing vehicle, or to drop explosives to clear battlefield obstacles