Continuous movement looping

I am trying to construct a title screen for a project that I’m working on; on this title screen will be a car that appears to be moving constantly to the side, from a side-scroller-esque perspective. The way that I am currently working on accomplishing this is by having multiple custom rock models scroll across the background, and teleport from one side of the screen back to their original starting point once they leave the player’s view.

The movement that I am thinking of is very similar to the gif shown below of the Wario Land 4 title screen - the rocks in the background would continuously loop while keeping their spacing whenever they go offscreen.

40595-warioland.gif

One of the major problems that I’m having with this, however, is that I can’t make the rocks move at all without using a matinee to put them on a set path, though with a matinee I can’t make it loop smoothly the way I want it to.

Any help at all on how I could do this would be greatly appreciated.

//Video showing proper background rock looping (around 1:22) Warioland 4 HD [ Intro Title Screen ] - YouTube