Originally Posted by Pugga
Some of the caps that come with provisions for a roof rack are built more sturdy to support the additional weight on the roof. You can't do that kind of upgrade aftermarket.
I don't believe mine was built with anything extra...my roof rails and racks are like the Yakima/Thule type, for bikes, kayaks, cargo box, etc.
I have put ladders up there quite frequently with no stresses at all. Sure a light bar wouldn't add anything.
The rails might even be found off a cap at a breaker yard??