Thanks, Clubhouse, for the suggestion. It caused me to look in the owners manual(duh!) to find that the system is sized for Group 27 battery. I called Jayco and they said you could add another Group 27 battery. So looking at the weight on Interstate batteries in Group 27, I see 55 pounds or so apiece for 110 total. Mine are going to be 145, so I'm not as concerned as I was before. I'd still like more real life experience info if anyone has done what I'm planning. (And thanks, DZ, for your input)
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2014 Eagle HT 27.5 BHT
2013 GMC Sierra 2500 Duramax
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