Gobi rack is definitely a good solid rack, I have one fitted with an ARB rear bar and it fits without any issues.
I've recently returned from a Victorian high country trip, where the gobi rack gave me the capability to stay off-road without resupplying myself with fuel/water for 5 days of off-road driving every day all day.
With heavy weight it pays to give it a going over at the end of the day to check to see if any of the support brackets have jiggled loose,
However these are very easy to re tighten.
The rack has held up on many occasions on tuff tracks where the jeep was swinging side to side over corrugations.
It dose however increase your fuel economy on the long trips where usually your fuel goes down on the highway it seems to stay up. However this is the same for all racks, increase your wind resistance=increase fuel Eco !