VXorado, have you seen this page?
http://www.nofuture.com/myvx/mods/mods.htm
looks like the type of you you like to do. I went to buy 2 jerry cans todays and 2 lockable carriers like this one:
http://www.ebay.com/itm/260849003226...84.m1423.l2649
but i'm buying a more "square" shaped can so it doesn't stick out too much on top of the roof rack.