Hey John (@JW05)!
Cool idea! You can have a look at the project I have done. First make a copy of it. The only thing that bothers me is the size of your geometry as I mentioned before. May be you can re-scale it to an appropriate level which you can also do via geometry operation available on SimScale. Create the mesh again following the mesh already created. And assign it back to one of the simulation.
The only thing you need to then change will be force which you can calculate according to the car weight and acceleration and that totally depends on you what you want to take.
First try doing it this way. If you are still stuck, ask me anytime.