Orient Hovering Vechile Along Surface

Hey, I am trying to create an Hover car / spaceship racing game. I have got the Hover mechanics and spring physics working. Now I am stuck trying to get my Vehicle to orientate itself with the surface of the track as it changes direction and slope. I will attach some screens, I hope someone can give me a hand here.
(Also if I change the Rinterp speed higher than 0.001 my game begins to lag).