I have a 120lb CVT Mt Bachelor RTT on my rhino rack backbone system. I bought the 2 bar, heavy-duty (square) bar system. I have at least 2000 miles and now 2 good days of offroading on the system with the RTT, and so far so good.
One drawback was wind noise with an empty rack, mine whistled at speeds from 20mph and up.
With the RTT mounted, the whistle is gone.
https://lh3.googleusercontent.com/-YJFtwVeFK8Y/Vbv-bzDXVAI/AAAAAAAAimc/Bl11b7maP1s/s800-Ic4
[img]https://lh3.googleusercontent.com/-Z6gNz7pCXWw/VhrD77__cCI/AAAAAAAAkG0/LWSIgCiHRcQ/s800-Ic42/20151010_103503.jpg