What those crazy Americans get up to when they want to do BIG milage on a Multistrada. Auxillary fuel tank on a custom mount where the pillion seat normally goes. (This was created for a long distance Iron Butt rally)
That guy posted up a full list of his modifications for iron butt on the US site. A lot of additional kit on his bike.
Not my kind of thing, but you’ve certainly got to take your hat off to him. It was an interesting build.