Mazda5 Roof Weight bearing Capacity

Sorry if this has been answered elsewhere.

How much weight can one secure in TOTAL on the top of a 2012 Mazda5?

I have an Inno cargo box (BRA585) secured on top of Thule roof rack load bars (RB47 aero with Thule foot packs).

I guess I'll have to substract the weight of the cargo box and the load bars from the total mazda5 roof weight bearing capacity but I don't know what that total weight bearing capacity is.
 
The weight limit is determined by the rack you use. Best thing to do is read the install guide for your rack. One thing I learned is that the aero bars, while they are cooler/low profile looking and quiet, have a lower cargo capacity, somewhere in the 200 ballpark. Square bars carry more weight. IIRC, both the 1st and 2nd gen OEM bars have a 250lbs(?) limit and, as you stated, you have to subtract everything that goes on it.
 
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