Are the driver parameters unlocked so the operator can adjust the speed / steering etc?
Is somebody using an older BT can service key OR Truckcom on these trucks?
If there still under warranty then they should be on software package version ending XXXXXXX - 010, if there not get the Toyota engineer to update the software on the next visit.
What capacity spec RRE is it?
What broke on the wheel?
What piston broke & what actually broke on it?
Ive seen a reach ram internal threaded rod snapped but that was caused be operator error & heavy impact damage.
Might be an idea for the owner to escalate the repeated issues to a complaint so it can be investigated higher up.
BT Toyota always encourage there engineers to feedback on any quality / build / software concerns they see / have so they can be investigated & then eliminated.
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