From what I have heard, the Tigerz11 alloy racks will bend if you look at them the wrong way.
As for cracking when out in the sticks, alloy has come a long way in the last 10-20 years. You rarely hear about good brands of alloy racks failing these days.
I've had a full length Chinese rack and since removing it I have no inclination to refit it again. Apart from the fact that it takes three people to fit, it drops the car a good inch due to its weight, and it's rusting too so either I'd need to clean it up and repaint it, or be forever cleaning rust stains off the roof of the Patrol. It also makes the vehicle too high for pretty much any under-building carpark, they average 2.1m clearance and the highest seems to be 2.3m - but I'm around 2.4m with the big rack fitted.
Instead I have opted for a combination set-up - I have a set of aero bars that I fit a Thule pod to, when I don't need to carry heaps of gear - say for a weekend away leaving the CT at home. The pod is great because it is water and dust proof, and lockable.
I also have a set of Rhino heavy duty bars, that I want to supplement with a third and maybe fourth bar. These can carry my 2.5m long awning on the side, and my 1.2m rear awning, plus take a basket of some sort for additional load duties (I'm still working out the basket option but a Rhino alloy tray is looking good).
And both sets of bars (minus the pod, which is a 2 minute job to remove) keep the overall height low enough for most carparks.
The big rack is now on the father in law's 60 Series and as far as I'm concerned it can stay there...