Applying opposing force if object exceeds rotation limit?

I have a vehicle using Wheel Colliders and moved with engineTorque that moves left or right on the X-axis. It's a heavy vehicle, so the mass is set high and I do have the center of mass at the very bottom of the rigid body, but it also needs to move fast due to gameplay purposes.

At high speeds it can still flip over, despite having a high mass. I scripted its z-rotation to reset to 0 if it exceeded 15 degrees like so:

 if(transform.rotation.eulerAngles.z > zRotationLimit){
             transform.rotation = Quaternion.identity;
         }

But it neutralizes the physics of the wheel colliders' springs and suspension, which I don't want and when it does flip and exceed zRotationLimit the rigid body just instantly snaps back down, which obviously doesn't look good. Would applying some kind of force to the opposite side of the vehicle when it tries to flip be a better solution? I've read about scripting stabilizer/anti-roll bars but this vehicle never turns so I don't know how they would work here.