When I refer to roof rails I am talking about the stock rails that come attached to the car roof. I can’t say whether or not you should get the crossbars. I , myself, had the idea of going ahead and buying the cross
bars and having them installed. I was thinking that they maybe would hold the roof rails down in the back like they are supposed to be. But after really looking at the rails and where the crossbars would attach, the crossbars would be up higher on the rails, not even near where the rails lift up in the back (at the tail end of the rail) so I don’t think crossbars would be a solution to my particular problem. (Plus, it would be a big expense for me when I would never use them! ) I think if you have a use for crossbars there is no reason not to install them. I don’t think they would affect the rail raising in the back in any way. If it is going to happen, it’s going to happen, crossbars or no crossbars.