Yeah, I've been working as a safety officer for the last 15 years so quite versed in the prevention of falls standards. 
 
Anyway, thanks for the replies and I believe I have the solution to the potential dimensional fouling issues. A number of different hitch mount adapters that replace the towball are available which will extend the rack, lowering the position which will allow access to the rear via back door with loaded rack. The main reason this is important to let my pet monkeys in and out of the back rather than climbing through the cabin which I'm sure they wouldn't mind. I'll post some picks when its all hooked up as a reference for anyone looking into it in future, cheers.   

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