P-40 Armour, 1S12 Long track

The P-40 "Armour" or 1S12 (also referred to by the NATO reporting name "Long Track" in the west) - 3-D UHF radar developed and operated by the former Soviet Union.

Use chassis T-54/55?

In fact it is taken from AT-T. But additional wheels has been added. Artilleriyskiy Tyagach Tyazholiy, or AT-T was a Soviet Cold War-era artillery tractor. The AT-T is based on the chassis and drive system from the T-54 tank. However, the hull has been rotated 180 degrees, with the engine, clutch, gearbox, steering gear and the drive wheels located at the front of the vehicle.