What THEY say and what WE do are two different things ...
3 x Rhino HD bars 17kg
1 x Rhino 2m AT alloy tray with sides (3 mount version) 21Kg
1 x Fittings tray to bars 3kg
1 x Foxwing awning 23kg
3 x Foxwing mounts 4kg
2 x Rhino shoval mounts + 1 x f/glass handled shovel 3kg
TOTAL = 71kg
... and that's permanently mount on the D2 roof.
Then add an RV5 22kg
A small Rhino canvas bag with a double height queen airbed, single air bed, 3x sleeping bags, 2 sheets .... and the side walls kit, front wall kit, fly kit, 2 Oztenet king chairs, and a 3rd small alloy folding chair ... and sometimes a chainsaw carry box with saw, fuel oil, tools, spare chains ...
That's over 100kg. 5 years and no problems travelling like this. I just remind my self there's an extra 100kg passenger on the roof and drive accordingly !! 
We now have the kamper so usually no load on the roof except the bars/tray/wing ... moved required stuff into kamper.
Kev..
2014 Isuzu MUX LST with fruit
2008 Isuzu D-Max
2015 Kimberley Kamper "Classic"
Gone ... 2004 D2a Td5 Auto "Classic Country" Vienna Green
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