Sure - you can route the rear strap over or under a rack. I had the Dirtbagz on my 610 with the oem rack, and it fits close to the fender. I have a Moose folding toolpack on my 630, and originally had the rear strap underneath it, but to make it easier to R&R the Dirtbagz - I run the strap over it.
I was [am] only concerned with how they attach, do they share mounting bolts ? I would not have them mounted 90% of the time as I do mostly day/ single track expeditions.
LA Bike Show... Dirtbagz brought their stuff from CO for the show. Special: $219 for the Ranger Package, no tax, no ship. Cinched the deal.
Berg has un-painted ones now if you want to place an order directly. Unless he sent them all off for powdercoating...
Talked to Berg today, and the racks are being powder coated. I ordered my racks while I was at it, along with some of the Rotopax mounting plates so I can carry extra fuel until I spring for the Safari tank.