Ref supporting the roofrack on the rear:
On the "Brownchurch" expedition model for LR's, the rear of the rack is supported by a ladder on one side, which takes the weight down to the rear cross member / bumber. And on the other side by a bar which comes down off the roofrack to waistline of the vehicle (ie where the hard top sits on the rear tray) and bolts through the body.
The front of the rack has support bars which attach to the pillar brackets at the bottom of your windscreen.
Ref pictures go to brownchurch's website: www.brownchurch.co.uk
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