As some people know, I have made a bruckell legran limousine, and have succesfully relocated the entire suspension JBeam, apart from the wheels. I understand that the wheel's position is based off the rtwo nodes, but I need to find where the original nodes are located, so I can offset the wheels correctly.
I think more detail of what you want is needed since I can't tell what you are trying to do. Are you talking about the wheel offset value or about moving the wheels backwards?
The wheels themselves are in the common folder, and the xyz offset is introduced by nodeOffset in the wheel slot in suspension jbeam. Look here in legran_suspension_R.jbeam:
The inner/center node of the pressureWheel is usually the center node in the wheel hub (likely in the suspension jbeam). The wheel structure is probably where it's supposed to be already, what you need to reposition is the visible mesh (the "flexbody") of the rear wheels. Follow these instruction to place the mesh correctly. EDIT - Better answer above, please delete this.