Join Date: Nov 2004
Location: parts unknown
Bikes: surly steamroller w/coaster brake, electra single speed cruiser, specialized rockhopper commuter, no-name single speed folder, 700c ultimate wheel, 24" unicycle, specialized bmx lsd, single seat single speed huffy tandem, pink upsidedown parade bike
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You could also increase the rake of the fork(s) so they line up. That would, of course, increase the stress on your headset(s).
Is having the top frame in the middle that necessary? Keeping the majority your gear over the rear wheel/behind the seat tube of the top frame should be enough to keep your center of gravity back where you want it to be. Not too long ago I saw a picture of a touring tall bike that had a loaded Xtracycle on the bottom. Looked like nothing short of hitting a 2 foot wall would have made it endo.