Hello from France
I good friend of mine has an Arca Swiss F-classic 8x10" and he uses it with a B2 ballhead (the B2 has separate tilt controls on both directions, unlike the B1)
The B2 is now discontinued and is
replaced by the Z2+ which is smaller and ligter but as strong (Z2+ display model at the recent 2012 photokina, fitted with the new "Monoballfix" small plate system, of course you can have it fitted with the traditonal quick-release plate system, same width as the telescopic F-line rail)
Using a short 15cm rail in front is
exactly what Arca Swiss offers with the 8x10" misura model, where the rail is foldable in two unequal halves, 15 cm in front and 27 cm at the back. I doubt that this very special rail specific to the 8x10" misura is sold separately, though.
However using a telescopic rail with a 15cm element rail in front, as used in the field by many arcaphiles, allows to collapse the whole camera into something extremely compact, depending of course on the bellows in use. As far as I understand it (this was explained here a few years ago by one of our forum contributors), you can easily slide/detach the whole camera collapsed on the 15 cm rail element, from the telescopic rail, you store the camera and then detach the rail from the tripod head.
Images of the 8x10" misura to see the 15cm + 27 cm folded rail
the official portrait
an un-authorized portrait, recently "stolen" in Köln ; the camera is supported by a d4m ballhead, with the small plate attaching system, same width as the folding rail alone, or same width as the upper parts of the telescopic rail assembly
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