Before I put a set of Teraflex rails on I did the DIY thing by drilling holes in the roof and corner bracing plates on the roll bar. Mounted a rolla cage to carry spares and fuel. Used on a trip that included the Tanami and Gibb river roads. Weren't a lot of options when I did this. Worked well but the Teraflex option is pretty good with templates for holes. I'd recomend going fo one of the options that either pick up the roll cage or have bracing down to the tub.
80kg dynamic load is probably a bit much just mounted to fibreglass.
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