That is something I would not recommend… especially if you are looking for soft body physics in vehicles. They do have beamNG integrated now yes, but you are going to go through a nightmare setting up the vehicles. That is one of the main reasons I ditched CE (as well as the documentation and the lack of support).
In my opinion, if you are a programmer, programming in the necessary components into the physics engine would give you a better all around system in the end compared to what is currently available in CE.
I am not the one to ask about implementing (sorry ;)), but I am sure there are some others here who can point you in the right direction.