I too went with the yamaha rack and went the 1.5" star washers for added support as the top is ABS and not fiberglass. Two trips - lots more than 10lbs and no problems.
EMCM(SS) USN Ret.
09 Vulcan Nomad Diablo Black
Avon grips with Racnray's Invention (Throttle Mod)
Kuryakyn Power Port
RAM GPS mount
Voyager Trunk Kit ($OUCH$)
Yamaha Trunk Rack
Removable windshield Kit and Lowers!
K&N Air Filter
Day-Long Seat (best seat ever!)
Red Line 10w-40 MC Oil