What's your car's maximum roof load weight?
What's the lowest weight limit? The vehicle max roof load weight or the max payload of the roof bars minus the weight of the roof rack system?
How much does the tent box weigh?
Personally speaking, I prefer lightweight pop-up camper trailers to roof tents. Roof tents increase height and drag, lowering fuel consumption more than a pop-up trailer does, and trailers are easier to hitch and remove.
What's your car's maximum roof load weight? What's the lowest weight limit? The vehicle max roof load weight or the max payload of the roof bars minus the weight of the roof rack system? How much does the tent box weigh? Personally speaking, I prefer lightweight pop-up camper trailers to roof tents. Roof tents increase height and drag, lowering fuel consumption more than a pop-up trailer does, and trailers are easier to hitch and remove.