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That type is not for a track.
If you could somehow replace the single wheels on each end with double wheels, you coudl possibly use it on a PVC track
You could also try attaching two lengths of PVC together side by side so the single wheels of your dolly sit in the depression made by the curvature of the pvc where they touch. Of course you'd need two sets of PVC (that is four lengths) running in parallel (one where two of the dolly wheels would sit, and second for the third wheel).