Yer, most of the roof is just rubbish thin tin.I’ve been thinking to use 8mm pop rivers to rivet steel plates to the roof and then rivet the rails to the plates. I own this thing which makes it quite easy https://sydneytools.com.au/product/...s-brushless-accubird-pro-rivet-tool-combo-kit.
With that said I have a 42inch stedi light bar, 20 litre Jerry can and roof pod with recovery straps as the only stuff I carry up there so I’m hopeful.
Any factory mounting points will have a secondary plate most likely with a bit of shape designed in it, to add strength while spreading the load over an area.
Your idea, would certainly be better than a few nutserts through the roof skin.