I'm about to change out the chassis batteries in our Allegro. It has Interstate 31-MHD batteries now. They are original to our 2012 model so I'm thinking they were installed in 2011 making them 5 year...
I said I was going to change out my batteries. Didn't ask whether I needed to. And I do agree. New Interstate batteries are $111 each. Not much cheaper at Sams. I'm of the opinion that AGM would cost more than that. But again the tech said AGM. And this dealer sells Tiffin new. Thought he would know. They are maintenance free. So I guess 4 or 5 years life isn't bad.