Is the weight limit for a moving vehicle only? I want to put a rooftop tent on which weighs 53kg. With 2 people with a combined weight of 170kg puts it over the limit. Where as my moving load will be no more than 60kg once solar panel and maxtrax etc are ontop of that
Going a little over is probably okay. You can almost certainly put more weight on your roof and drive around. But keep in mind that more weight up top will greatly increase the center of gravity. And your chances of rollover (proofs here).
I wouldn’t go more over long distances. Not worth the risk because you never know when you need to make a quick maneuver.