There is the older WDL version,
but I don't think it can be mixed with the lite-C
(WDL is C-script, .C is Lite-C).
You might want to use the demo code and build from there
(the code is all there in the .C file).
The WDL code for vehicles is in "templates" directory,
templates6, -->code (I am at work now, but offhand I think that
is where it is).
Also, JCL is working on a the new T7 engine, which could
make things really easy to get vehicle physics working.
-Jim