I'd be very interested in any info on adding roof racks to a very early LG Silver Shadow. I forget the year, early 2000s? (No roof window, minimal/rudimentary electrical)
My concern is stressing the roof to sidewall joint. Intuition tells me the mount needs to be on the side panels with a tight/fixed rack width across the top so that the load will not produce flexure of the roof/side panel connections. While I'd love to carry my kayaks, I suspect they'd need to be supported on a steel structure wrapping back down to the sub frame. And I don't want to set it on fire welding to the sub-frame!
And if anyone has stories of failures, those are always useful too!