Way to stop the navmesh obstacle avoidance pushing other agents around when they bump into each other

Hello. I am using Unity's navmesh system to make an RTS game with tanks.

When the tanks get close to each other, the avoidance system kicks in and they try to get out of each other's way. However, they often bump into each other and end up pushing others out of the way. This shouldn't be possible with vehicles as heavy as tanks, and it looks unnatural.

Is there a way to have the navmesh agents try and avoid each other, but not bump into each other, and if they do, definitely not push each other around?

I have tried altering the obstacle avoidance priority, but there is still at least always one tank that pushes others out of the way.

I have also tried altering the rigidbody, for example making stationary tanks work with gravity and making them really heavy. I have also frozen all rigidbody constraints. However, other tanks are still able to push them out of the way with ease.

At the moment, when tanks stop moving I have made a navmesh obstacle appear under them, which helps with avoidance. However, this only works if they are stationary - moving tanks can still be pushed around by others.

Any ideas or suggestions for how to solve this would be greatly appreciated!