I just set the bike up for a trial run with the ammo can. Works great! I am using a Bundeswehr Flekcktarn Cammo pair of combat pants (West German Army issue) as the pad between the can and rack. I have an old military gear strap of unknown origin that is now the new can-cargo strap. I will replace the Flecktarn with a piece of BGS cammo gear when I get a chance to pick up a piece at a good price. They show up on eBay pretty regularly.
Rode the bike down the street and back............ cruises perfectly!