I run two N70** series in parallel. 550 is a bit small and depending what additional electrics you are running.
Combined new I had nearly 1200cca and man did it crank!!!
As both of mine are looking to be replaced as they are about 5 years old am looking at cranking deep cycles for a change. 
 
Supercharge Batteries - Car Batteries, Maintenance, Expanded Grid Technology
 
Just need to check out the the charge limitations if any being deep cycle. Think these may be an AGM style.
 
MRV70 for right hand side and MRV70L for left hand.
 
			
		
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