Unless they changed them, the dynamic rating is 110 lbs and the static rating is 450 lbs. That means you shouldn't have more than 110 lbs on the roof while driving (dynamic weight) or 450 lbs while stopped (static weight). You will find very few roof top tents that meet those limitations, and I would question the material/durability of a tent that weighs 110 lbs or less.
Roof top tents have pros, for sure, but they also have many cons (wind, noise, putting it away wet, moving to other locations, etc.). If I were you, I'd do a search on Youtube and watch some videos on the cons, because they may be annoying enough that you forego the roof top tent.
I will say, they scream hardcore overlander!
2022 Jeep JLR, manual with even more extra guacamole
Sold - 2021 Jeep JLR, manual w/extra guacamole
Burtoni Motors, Deano Bronc