We've had customers with wide pull type bars use Joe's approach and with well-designed legs on the standoffs it really isn't too bad to hook up, that's why he suggested it. It is an especially good approach when you want to use the 6000 for side dressing/between the rows and on the tractor tires and the Pluribus on the rows and between the tractor tires. The standoffs let you shift the rear bar 15" without interference.

In the above system with 12R30 mounted toolbars, I agree that 2 separate bars is probably the way to go. On a 60 ft pull type Joe's standoff idea is the way to go. 

Jim at Dawn