Good plan. Yup, two hundred rounds ought to do it.Just a small one for carrying a few bits and pieces for emergencies. Nothing massive! I could mount it to the plate with wing nuts, and a spacer between the plate and box, so the mounting plate would stay in situ whether the box is mounted or not, but as it would pretty much do everywhere with the bike anyway being a permanent fixture is not really an issue. I want a small fuel can for the other side, and the Rotopax mounts come as a pair.