I currently have 2 roof racks holding a big Yakima roof box. I think it is a Yakima skybox. I have a Reese Towpower Highland 2006200 from Amazon. It is rating to hold 150lbs per bar. It has a load rating of 300-400lbs evenly distributed. I am going to say 300lbs to be on the safe side.
I am looking to add a narrow/skinny roof box. I am not sure if I should use the existing 2 roof racks or add 2 more roof racks. I am going to guess both roof boxes will add up to 100lbs empty. It could be more or less. I do not think I will have 200lbs of stuff but I do not know. I am not going to try to put something in the roof box if I cannot get it on the roof myself or require 2 people to get it up there. #lifestyle