I just went on my first ride with the biggest Givi trunk. I
bolted the Givi adapter plate to a OEM Honda rear rack,
adjusted it as far forward as I could and still open the
saddlebags. My bike is set up for solo, no passenger
seat. Scott from OK told me a weld on his OEM honda rack
finally failed when he did a similar set-up once,
so if I was to do it again, I'd use one of those solid
metal/folded aftermarket racks. Everything about this
set-up worked great for me on this recent 10 day trip.
The whole things pops right off and turns into a suitcase
with a nice handle when you get the motel

The best thing is that it will all be gone with just the
removel of the four OEM rack bolts.

-Mike