Has anyone fitted a roof rack and/or roof box to their Prius. If so, do you know what the maximum roof loading is? I'm off on a long touring holiday on Friday and will be taking a 470 litre top box, capable of 60 Kilos (about
132 lb) but I don't want to load it above whatever Toyota says is the max. All specs I've seen for roof bar loads for the Prius say N/A - I presume this is because the Prius isn't fitted with longitudinal roof bars as standard - but side-to-side bars are available as an accessory, so I presume loads can be carried on the roof. I just can't find any info on the maximum load. Help, please!