The RIG shown in the clip above can follow a flat curve. You must only select the curve and animate the position parameter of the RIG. With the help of sliders you can also open and close the doors and lids of the model and control the suspension height. It should be noted that the RIG uses Cinema 4D C.O.F.F.E.E as the primary language and is a compatible Cinema 4D versions from R13 to R19.

You can buy the RIG at TurboSquid.