Just to ad a little to this. I made a rack and made six feet that sat in the gutter. Four inches by 10 mm. Since the off roader has been parked up I've sat two complete pairs of axles up there. With moving the truck about a fair bit the gutter has slightly got missed shaped but you would be surprised just how much weight can be loaded onto a rack with no issue at all.
Obviously better to have as much area to spread the load. I'd say four feet per side would be fine for anything to be loaded on the rack.
Yeah maybe next time..... I think I need to learn how to weld aluminum and make the feet and flat bar out of that, or else it will end up being too heavy.
Has anyone successfully welded aluminum with a MIG? Or is TIG the answer?
Even with the 4 feet currently, I've had a spare wheel and 5 bags of wood up there with no problem. I don't really plan to have too much weight up there - a few jerry cans of diesel, some equipment, the side awning and the swag bags. Probably 100kgs at most.
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