[Kevan]

For 'wheels on axles' tyre truing the Tire Razor is the most popular.  There's a couple of similar alternatives, one of which is the RSM truer which I have.

There's also a free to download and print motorised base to move the slider plate back & forth.

I used the original Tire Razor files but ended up redesigning the whole thing, the only part I kept as-is was the little motor arm.

Since this video I've added retainer/rollers to take the sideways slop out of the slider and made the magnetic hitch plate thicker and put one each end so the wet & dry paper can get two clean runs.