E21 sidecases totally....best place for mass....low and split side to side. I try to locate as much mass as I can, as low as I can. I've even gone to the extent to wrap and zip-tie my tire levers to the subframe.
While I do have an E52 topcase, IF it gets used, I ride with it empty and use it to stow my riding gear when I arrive. Too much weight up there makes for an unsettling ride.
DL650K5, Race Tech Forks, Scotts Stabilizer, SuperBrace, Staintune Exhaust, GSXR Calipers, Fastway EVO III Pegs, Givi Crash Bars, Motoagora Bellypan, TouraTech Rad Guard, Givi E21 / E41 Cases, Givi E52 Topcase, Cortech SuperMini Tankbag, Suzuki Euro Screen / Givi Touring Screen, Madstad Bracket, Kaoko Throttle Lock, Suzuki Heated Grips & Handguards, Dual PowerLet Outlets, Pat Walsh Dash Shelf, V1 Radar Locator, Garmin Zumo 550.