Weight limit for roof rack with moon roof?

[raincoat_cat]

Weight limit for roof rack with moon roof?

 

Hi all,

 

Looking for some advice, I have a 2007 Alphard with the moon roof. I recently got a roof rack for it from Japan, not yet figured out the fitting with the Japanese handbook, this week's task...(side note if anyone has the guide in English please let me know!).

 

The roofrack bars have a weight limit of 50kg, but my understanding is that having a moon roof window will likely reduce my load capacity for the roof. Does anyone know what it would be?

 

I'm planning on putting two sea kayaks on the roof.

 

Thanks in advance!!

Cat