BAE System’s massive ARCHER 155mm Self-Propelled Wheeled Howitzer. The U.S. Army is supposedly testing this, along with other contenders, for a wheeled SPH to supplement the fast moving Stryker Brigade Combat Teams and other lighter mechanized forces.
The turret is fully autonomous with shell loading, and gun elevation, rotation, and firing. The firing is done from inside the armored crew cab. The howitzer turret can pivot and elevate on its own and the articulated chassis increases survivability.
Photo from BAE Systems.