Originally Posted by o2batsea
Having looked through parts catalogs from the 1950 and 60s that part doesn't even show on the upper tailgate and roof sections.
Parts books from the 60s show two types of supports for the rear door. A strut style, with one on each side and the "quadrant" style which is similar to the folding hood stay.
Photo is the strut style
A friend of mine runs a land rover / range rover specialty repair shop. Based on his experience, they are capable of stopping anywhere, anytime, at any cost.
I don't know about the brakes, only their unreliability.