Out of my wheelhouse with towable travel trailers. My motorhome had four 12-volt deep cycle house batteries. When it came time to replace them I was shocked at the cost for those suckers. Replaced them instead with four Costco 6-volt golf cart batteries at $80 each that had almost the same AH rating. Will say though they do not do well cranking the 10K diesel generator. Sometimes have to start the engine first to get the generator started. Not a big deal for all the bucks I saved though.
Yea, deep cycle batteries typically don't do well starting engines. Newer batteries like the yellow top optima or batteries like mine do really well as dual purpose batteries. But you pay a small fortune for them. If I had the room I likely would have gone 6v myself but due to weight restrictions I went this route.
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