Removing game pieces from Trailers

[PhilBot]

Is it just me or is there a general lack of rules regarding removing game pieces from trailers?

OK, I know the robot can't extend beyond the 28x38x50 size, so it's hard to make a boom to reach out and remove balls from your own traler, or from a team mate's... but if your robot was built smaller, eg: 28x24 it's possible that you could reach out 14" into a team-mate's tralier and remove their balls (so to speak).

Can't see where the rules prevent this.???

Likewise, any reason why your robot can't reach back and sheild your own trailer or flick balls out when they get deposited?

What have I missed?

Phil.