I just replaced all batteries on our 2008 Dynasty. ISL 425 HP. The commercial battery supplier I purchased from sells all kinds, types and brands so no sales pitch on any particular battery. My coach is in the heat of the southwest desert full time. According to the battery supplier the flooded batteries average life span here is 27 months. AGM's is 64 months. Lithium batteries are not popular here due to high heat in the summer and cold in the winter. I did the math and the AGM's all the way around made sense for me as if I miss/forget to check water level in the batteries, that will shorten battery life greatly. Since we dry camp in the middle of nowhere 90% of the time battery power is critical. Chassis batteries are 2 ea. Odyssey Extreme1150 CC @ 0 degrees AGM's and 4ea Life Line GPL-4DL for the house batteries. I went with 4ea big 12 volt over 8ea 6 volt as it was the same amp hours for less money. Higher initial cost but I am banking on the long haul overall cost in 6 years from now. Just my opion and everyone has different needs.