With my D40, I used 2 original sports bars(front one as originally fitted and the rear one turned back to front) and had them welded together - 3 pieces of aluminium bar. Then mounted the tent to the bars and it lives there pernanently. No probs with strenght - been to Birdsville and back.
Rooftop tent good way to camp - bit crappy when the wind and rains comes up.
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