Cab Lights and Marker Lights are different. The Marker Lights are on the Fenders at the widest point (hence on the rear of the dually’s and the front/rear fenders of the Raptor and the TRX).
My guess is the three marker lights (normally cab lights) in the middle of the Raptor and TRX grill have to be at a minimum height. The back marker lights are a little different. On the TRX and most dually’s they are roughly rear bumper height, where on the Raptor they are included with the 3rd break light.
I did some googling, but couldn’t find a simple answer.
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