Erik,
If you are talking about the Grand Erg plates, I'm going to fit them the way you describe. You can't achieve this with alu plates because when they are bent, they won't go into the channels. Camel Trophy mounting style relies on two oversize washers and two bolts with regular nuts to fix the plates to the sides of the roof rack (two each side).
For alu plates I have fabricated a system whereby the plates are first hanged on two hooks and then bolted down in the middle with a single large screw (without the use of a spanner) that is secured by a padlock.
Never tried using this while on the move, but if you are concerned about having to retrace your route to recover the plates, tie them to the rear bumper with a piece of string.
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Roman (UK)
www.polandrover.com
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Roman (UK)
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