In this mod, any adder will take VERY minimal damage. They will only get a few scratches, hardly broken windows, and very unlikely any deformities or damage to the motor in the worst crash or tumble. They won't blow up when you fall on the top. If you pop a tire it will go right back to normal even without bullet proof tires. You will still fly out of the windshield. They are not immune to explosions. I haven't tested them being submerged in water.

Installation: Open Open IV
Open common.rpf then data
Enable edit mode
Drag handling.meta in that folder
Get out of common.rpf
Open the folder uppdate then update.rpf
Go to common then data
Drag handling.meta into that folder.
Close Open IV