Updated.
Thanks for reporting! The errror was caused by "Soha's Physics" being overwritten, since the changes are no longer patched in by Custom Workshop Installer.

I get this error when attempting to launch the game while having this mod installed:

!Script error

Thread: THRD-RUNVMI Whisper_Q1000XL.updatevariables
Error: name cannot be parsed

java.game.parts.rgearpart.reciprocatingrgearpart.Brake:updatevariables (line:47)
java.game.parts.rgearpart.reciprocatingrgearpart.brake.DiscBrake:updatevariables (line:56)
java.game.parts.bodypart.Chassis:updatevariables (line:406)
java.game.cars.Whisper_models:updatevariables (line:24)

This is after extensive testing (I was using a collection) and several clean installs. It seems like latest update broke something and causes a CTD.

will make car weight rebalance at some point

Now someone needs to make one for the cars, 2 tones for the Remo lmao