I've never had a problem keeping under the GVM (2 adults, 2 kids) buit the roof load is another issue. This was the subject of a protracted and heated argument between myself and LRA - the 50kg/30kg limit applies to gutter mounted roof racks according to LRA. Which basically means by the time you've put the rack up there you can carry a couple of bags of sugar and that's it 
having said that we've used a rack and generally carry the second spare, gas bottle, chairs, a bag with sleeping bags, mats and some odds and ends. Personally I'm happy to do this than have to worry about a trailer.
cheers, Andy
2003 DIIa TD5
Oval Split level roof rack
DIY Storage system
Barrett HF - Tango 1026
GME TX3200
Traxide dual battery controller
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