If you do want to install your roofrack rails over the gutter i suggest you rather drop the roof lining and use screws with washers and nuts instead of rivnuts.
How to install roof racks on a hilux.
They are designed to carry bulky items or to fasten containers and come in different designs and in varying weights and strengths.
One of the simplest ways to install roof racks on the top of your car is to use a factory made template which is available in the form of pre drilled holes.
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Place it at the side of the rail and drill a hole directly into your car s roof top using an electric drill.
The best place to fit the roofrack rails is just outside the gutter because the roof will still be strong there but you will only have one or two plates to drill through.
Make sure you get one and use it for such an installation.
Some offer accessories to assist in loading.
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