How do I get my vehicle to never be physics pushed by pawns?

I have a large truck with a high mass setting but pawns like to toss it around like a beach ball. How do I get its mass to be respected by pawns and not be moved at all by them but still block pawns?

pawns like to toss it around like a
beach ball

You may need to clarify what has been changed as the default behaviour for 5000kg vs 10kg physics simulated actor manifests like so:

Image from Gyazo

You can also fine-tune interactions here: