6dof - Translation only in the x and z axis with rotation

Hi

I am trying to simulate the displacement of a car due to a collapsing water column, I was able to get the result using 6dof by enabling only translation along the x and z-axis however now I also want to get the rotation of the car about the x-z axis as and its translation along the x and z-axis only but the option to restrict motion along the y-axis is greyed out thus causing my car to fall downward as shown below 

 

The option to restrict motion along the y-axis with rotation enabled is greyed out as shown below

 

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