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Okay, if you parent your cars to the wheel, I would create a control to act as your driver. Then key the wheel 0-360 degrees and using the driver control, say 0-360 as a new "wheel rotation" attribute.
Also key the cars 0 to negative 360 using the same driver. I think that should work, if that makes sense. Best thing to do is to experiment. If you have a question about how set driven keys works, feel free to ask.

Originally Posted by stwert

this is what i tried

select each individual cart and load as driven + select the wheel as driver and both on rotate x

i then pressed key in the driven key window at the first and last frame

i selected the carts on first frame on timeline set a key and rotatation at 0 on last frame set keyframe and rotation at -360

the same was done with the wheel but with +360

when i play the animation there's no movement Im doing something wrong somewhere sorry im a newbie