Why not look for a gas tank mount for under the rear, 
I have seen them advertised andI think they replace the fuel tank totally.
But
You could add in sill tanks, these sit under the frount seats on either side and you can have two for fuel or keep one for water.
I know the outlay would be higher but I think it would be worth it.
And sorry I am not sure on price, have been putting off asking about gas for mine.
				
			 
			
		 
			
				
			
			
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