hey Steve, I was in the same boat.I assumed they were designed to fit around the SMB additions but in our case that wasn't the case. Where the back end of the bars attach to the vans frame there wasn't enough clearance around the propane tank/lines on the drivers side or the house battery on the passenger side. I would've had to move both to get them on and I wasn't about to tackle that. I even had field Van in Reno try and they couldn't either. it doesn't matter RB vs EB as the extended body is just past the rear wheels - the wheel base is the same. My SMB is a 2000 Ford EB50 build, so I'm not sure but your year or build might be different underneath.