Yes, you can find any 3-wheels car on the market. for free.
Even with a guy, who will help you to resolve issues, for free.
You can also find many [video] tutorials with no extra text - just professional instructions, without comments and hints. (why should you bother about winter tires, who cares?)
You can find all of that - if you are going to look for it in correct place.
please read the section “Who is jMonkeyEngine for?” on the main page http://jmonkeyengine.org/ before asking about 3-wheels car here.