Hinge Joints Alternative?

[StudioTatsu]

Does softbody have a type of fixed rotation similar to unity's hinge joints?


I can't use unity's hinge joints because it requires a Connected Body (a rigidbody) to follow the transform.
https://docs.unity3d.com/Manual/class-HingeJoint.html


Basically, I'm trying to create softbody doors that can open and swing from softbody vehicles while driving. 
My vehicles are controlled by adding forces to softbodies. 
I'm not using rigidbodies at all, since the 4.1 update.
Without a connected body, the hinge joint is connected to the world and doesn't follow the vehicle.

Any help on or direction on this is greatly appreciated. Thanks.