Trucks vs. Locking Trucks?

Can someone explain the difference between rollers with trucks and rollers with locking trucks?

I have a Kelsey 5x8 and am looking into new rubber rollers through Ramco.

Thank you!

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Many platen roller cores have crimped lugs: two that the truck butts against for lateral position, and a third that fits into a keyway inside the truck, to keep it from rotating on the core.
For some reason some Kelsey cores lack lugs and the trucks a keyway, so the trucks can spin freely. Very bad design, roller slur uncontrollable unless roller bearers are used, and yes Kelsey sold special roller bearers to solve this problem.
Another fix is to drill and tap the truck for an Allen setscrew.