I had a Frontrunner rack fitted to my D4 initially. We broke 4 out of 6 mounts on the road up to Mitchell Falls on our Kimberley trip. With hindsight, the mounts were never going to be strong enough for that kind of road.
I've just had a Rhino rack platform fitted with the backbone mounts through TJM. It is a permanent install, and so far, we've been very happy with it.

