Gazebo model stuck in ground after enabling joint controllers

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Hi there.

I am struggling with getting my RC Car model to work properly with Gazebo. I have followed both the Gazebo and ROS tutorial on how to create the URDF (XACRO) files and the required Gazebo launch file. With just the joint state publisher I am able to view the model correctly in RVIZ. But whenever I include the joint controllers and spawn the model in Gazebo it will just spawn within the ground and without any wheel.

I have uploaded all the files to the following Git repository: https://github.com/mindThomas/JetsonC...

Any clues about what could be wrong? You can try and run the Gazebo model and see for yourself:

roslaunch jetsoncar_description gazebo.launch

Thank you in advance.

Best regards, Thomas Jespersen