How Can I Adjust The Weight of a Vehicle?

I created a vehicle but it doesn’t interact properly with player and AI pawns. When a player runs into the vehicle, it sends it flying into the air or moves it sideways. I set the mass of the vehicle to 50,000 kg but it didn’t have any effect on the physics interactions, it just slowed down the engine speed. I looked through the settings for vehicles and it doesn’t look like there are any physics settings. How can I get the vehicle physics to act properly? I am going for something like the vehicles in gta 5 where they can push each other around but players have a minimal effect on vehicle movement.