Regarding the "need" for an off road hitch, I too wonder at the requirement.
My boat trailer has been dragged behind the disco and now the 130 for the past 6 years over pretty much every road and track north of Cooktown.  Not once has it suffered from being a standard 50mm ball hitch.  The only thing that may be to its advantage is the axle is ~4m from the hitch such that articulation angles are less pronounced than on a short box trailer.
Maybe give it a go first and see how it behaves?
Steve
				
			 
			
		 
			
				
			
			
				'95 130 dual cab fender (gone to a better universe)
'10 130 dual cab fender (getting to know it's neurons)
			
			
		 
	
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