The passenger side of the tub sits closer to the cab than the drivers side, and you can see it by how the tub and cab side skirts dont line up. Also the top of the tub skirts that meet the body are cut substantially thinner then the top of the skirts on the cab, so because my tub sits awkwardly and both the skirts have been cut to thin, the drivers side skirts pretty much line up and the passenger one sits way to far in. But as you were saying, I had a quick look and the passenger rim does sit out further than the drivers, and I put this down to poor placement of my tub, it sits over all to the right by a few mm and is fitted on a weird angle.