Guys, I am so happy that you guys are photographers and not car sales men

for people who wants to travel anywhere with their car's and potential load their roof rack
but to the less inclined, the average car's roof carry capacity is 40-70kg while in motion, btw its very few people who that also photograph who fits within this weight class

These same car;s can carry up to 300kg load when not in motion... aka, people could sleep on top of their car's while the is stationary
this is not to say that there are car's with greater carry capacity, there is, such as real 4x4's not soft of roaders.
so to go back to what I said a few messages ago... check with your manual that your car's roof can carry the weight you are planning to carry, because there are roof top tents that exceed this limit
We have a Susuki Grand Vitara which can't carry a full sized roof tent, but that is not to say that some car's can't
Travel at your own risk
all the best :-)
Henrik