All vehicles should be repairable and drivable. Including military and civilian vehicles. Trucks, cars, cargo, bus, semi, tanks,ect.
Let me touch on the tanks a bit. To keep the game balanced, I think there should only be 1, to 2, repairable tanks per map. The repairable tanks should only spawn in heavily dangerous areas. Military base or city with high robot counts.
The tanks should need multiple parts that are very rare to spawn, including certain. Repair tools that are also rare.
My idea for repair parts should be:
Tank engine
Tank radiator
Tank barrel
Tank treds
Tank heavy duty battery
These items should only spawn In military bases and be incredibly rare.
The Tank should also not have unlimited ammo. You should have to find ammunition at military bases. And that also be rare.
It should need a special fuel type. Diesel I suppose. And that could be a rare fuel only found at certain gas stations or random industrial areas.
Tanks should also be very slow in mobility and have a cool down for each shot fired.
To be more balanced incase someone succeeds in repairing a tank, heavy artillery like grenade launchers should spawn around the map randomly and semi rarely.
This would be very fun in my opinion and give players more freedom in play.