I'm about to replace my 2-8D Lifeline AGM's. One died and the other I'm sure is not far behind. They were warranteed for 5yr-mine are 8yrs old. I'm going to buy them again-it's like not even having a battery-there is virtually no maintenance-except cleaning the terminals maybe every 2yrs.
On my truck I'm going to use the 2,800watt Magnum pure sine off 12vdc. Also going to use Lifeline L16 6v batteries. They are 400amp/hr apiece. Four total will give me 800amp/hrs at 12vdc. They weigh about 115lbs compared to the 8D's that weigh 160lbs. That extra 55lbs makes a big difference. If you have the room for the taller L16's, I'd use them (remember you can lay them down also!). Good Luck, TomC