Risking life, limb and XF I'll wade into these turbulent waters. I am and have been a supporter of this idea. Can the exhaust be routed so that the pipes exit in a "Y" shape leaving the center for a hitch to be attached there in some kind of way? When your not using the hitch you'd then have a dummy piece that looks like two pipes that fits into/over or onto the center to hide the fact that there is a hitch mount there something like this: You'd have a 4 pipe exhaust apearance, only two functional or a trailer/hitch attached with a working pipe on each side. I don't know and haven't looked under the rear to see how the exhaust comes back these guys torch, bend and reshape them it'd seem this part of the problem could be worked out in a simular fashion.