Its a Shino-Shiite Coalition design, masses in 75 tons. Armor layout is (front/side/rear/turret/top) 20/15/10/20/15cm and uses things like electro-reactive armor, semi-ablative armor, and other things.
Its main armament is a 150mm semi-automatic coil gun cannon called a Linear Cannon. It fires 30 kilo projectiles at 8km/s maximum, a 50mm linear cannon, an Active Defense System Free Electron Laser tuned to the violet visual spectrum, some countermeasure mortars, and a 15mm machine gun loaded with rounds with a CROW like system attached to it.
It's powered by an advanced fuel cell that has a combat range of 500 kilometers and drives the tank at an astonishing speed of 175km/h.
It has a powerful computerized cross-spectrum sensor package and a cheap Electronic Counter Wave Measures package with a limited LIDAR scrambler and IR 'smugger'. Fire Control is done by a powerful computer with reaction time in micro-seconds.
It's the Chinese Type 59 MBT, the standard Chinese tank of the year 2064, the year of the Third World War. Crewed by a crew of four this tank is one of the two tanks that are commonly used by the SSC forces.
Another would be a Union Design, a ZSU-37-4/2-UVB S4 'Zeus'. Masses in at 55 tons. If you know your old soviet/modern russian designation systems, then you would know that this has four 37mm linear autocannons that fire 15 kilo projectiles at 10km/s but the /2-UVB means two UV-B FEL pulse lasers. The S4 means it has a missile system designated as S4, which in this case fires up to 12 missiles at once against any aerial target including artillery shells and other artillery ordinance. It also equips two UV-B FEL ADS systems for added defense.
Uses a Hydrogen-Hydrogen fusion powerplant, with an infinite theoretical range (the only range factor would be the crew and vehicle condition). This plant can have the vehicle go up to 240km/h on a good day.
Armored with an insane composite that includes titanium mesh, carbon nanotubes, semi-ablative armor, electro-reactive armor, iridium alloys, and high-tech ceramics. This vehicle is armored with 15cm (on every surface) of the stuff.
The armament is guided by an AI driven FCS computer and the most advanced cross-spectrum sensor suite known to man, capable of defeating stealth systems. Reaction time is in nano-seconds like any other vehicle armed with this system.
Its really required in the story. Lasers, hypervelocity guns, hypervelocity missiles, particle beams, and plasma are commonplace, defenses upped to match. The Union however is crazy in making sure its crews survive.