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.
2011 Husqvarna TE310
2009 BMW F800GS
2007 HD Road King FLHR
2003 Husqvarna TE610e
1997 BMW K1100LT Special Edition