I went through east to west two weeks ago on an F800GS with caribou bags on (40" wide edge to edge). I was able to get through rather easily, although there wasn't tons of spare room.
2014 Ducati Multistrada 1200 Pikes Peak MNB Touring Edition
2009 BMW F800GS
2011 Husqvarna TE310 - 2003 Husqvarna TE610e
2007 HD Road King FLHR
1997 BMW K1100LT Special Edition