That's another thing of beauty with the Yakima bars, is they can be set at whatever spacing works for your load. I'd have moved the bars close enough together, strapped that barrel down like a kayak, and headed for Niagara Falls to seek fame and fortune (or maybe taken it home for an end table or planter)yes many things carry fine on a crossbar.
but just last week i was in KY, and bought an empty whiskey barrel. i was GOING to put it up on the roof, where i have three crossbars. but i realized its belly would be resting on the roof the entire trip home, scratching up the paint. this is because there is a fair space between the crossbars still. while i was trying to figure out some sort of padding to gin up, the wife emptied out the back, and we found the barrel fit fine (on top of my wood shelf) with the luggage all around it.
so there is one case where having a metal basket on the roof would have saved me a fair amount of work!